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class="VPSidebar" data-v-324e8308 data-v-b04a928c><div class="curtain" data-v-b04a928c></div><nav class="nav" id="VPSidebarNav" aria-labelledby="sidebar-aria-label" tabindex="-1" data-v-b04a928c><span class="visually-hidden" id="sidebar-aria-label" data-v-b04a928c> Sidebar Navigation </span><!--[--><!--]--><!--[--><div class="group" data-v-b04a928c><section class="VPSidebarItem level-0" data-v-b04a928c data-v-c356ab37><div class="item" role="button" tabindex="0" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><h2 class="text" data-v-c356ab37>overview</h2><!----></div><div class="items" data-v-c356ab37><!--[--><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/overview.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>overview of API</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-b04a928c><section class="VPSidebarItem level-0 collapsible has-active" data-v-b04a928c data-v-c356ab37><div class="item" role="button" tabindex="0" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><h2 class="text" data-v-c356ab37>packages</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-c356ab37><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-c356ab37><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></div></div><div class="items" data-v-c356ab37><!--[--><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/algorithm.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>algorithm</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/compare.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>compare</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/concurrency.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>concurrency</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/condition.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>condition</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/convertor.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>convertor</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/cryptor.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>cryptor</p><!--]--></a><!----></div><!----></div><section class="VPSidebarItem level-1 collapsible collapsed" data-v-c356ab37 data-v-c356ab37><div class="item" role="button" tabindex="0" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><h3 class="text" data-v-c356ab37>datastructure</h3><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-c356ab37><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-c356ab37><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></div></div><div class="items" data-v-c356ab37><!--[--><div class="VPSidebarItem level-2 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/datastructure/list.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>list</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-2 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/datastructure/copyonwritelist.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>safelist</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-2 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/datastructure/link.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>link</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-2 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/datastructure/stack.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>stack</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-2 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/datastructure/queue.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>queue</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-2 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/datastructure/heap.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>heap</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-2 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/datastructure/tree.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>tree</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-2 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/datastructure/set.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>set</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-2 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/datastructure/hashmap.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>hashmap</p><!--]--></a><!----></div><!----></div><!--]--></div></section><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/datetime.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>datetime</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/fileutil.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>fileutil</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/formatter.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>formatter</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/function.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>function</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/mathutil.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>mathutil</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/maputil.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>maputil</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/netutil.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>netutil</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/pointer.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>pointer</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/random.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>random</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/retry.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>retry</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/slice.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>slice</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/stream.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>stream</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/struct.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>struct</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/strutil.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>strutil</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/system.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>system</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/tuple.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>tuple</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/validator.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>validator</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-c356ab37 data-v-c356ab37><div class="item" data-v-c356ab37><div class="indicator" data-v-c356ab37></div><a class="VPLink link link" href="/en/api/packages/xerror.html" data-v-c356ab37><!--[--><p class="text" data-v-c356ab37>xerror</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-324e8308 data-v-3cf691b6><div class="VPDoc has-sidebar has-aside" data-v-3cf691b6 data-v-a3c25e27><!--[--><!--]--><div class="container" data-v-a3c25e27><div class="aside" data-v-a3c25e27><div class="aside-curtain" data-v-a3c25e27></div><div class="aside-container" data-v-a3c25e27><div class="aside-content" data-v-a3c25e27><div class="VPDocAside" data-v-a3c25e27 data-v-cb998dce><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" data-v-cb998dce data-v-c834746b><div class="content" data-v-c834746b><div class="outline-marker" data-v-c834746b></div><div class="outline-title" data-v-c834746b>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-c834746b><span class="visually-hidden" id="doc-outline-aria-label" data-v-c834746b> Table of Contents for current page </span><ul class="root" data-v-c834746b data-v-463da30f><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-cb998dce></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-a3c25e27><div class="content-container" data-v-a3c25e27><!--[--><!--]--><!----><main class="main" data-v-a3c25e27><div style="position:relative;" class="vp-doc _en_api_packages_function" data-v-a3c25e27><div><h1 id="Function" tabindex="-1">Function <a class="header-anchor" href="#Function" aria-label="Permalink to &quot;Function&quot;">​</a></h1><p>Package function can control the flow of function execution and support part of functional programming.</p><div STYLE="page-break-after: always;"></div><h2 id="Source-" tabindex="-1">Source: <a class="header-anchor" href="#Source-" aria-label="Permalink to &quot;Source:&quot;">​</a></h2><ul><li><a href="https://github.com/duke-git/lancet/blob/main/function/function.go" target="_blank" rel="noreferrer">https://github.com/duke-git/lancet/blob/main/function/function.go</a></li><li><a href="https://github.com/duke-git/lancet/blob/main/function/watcher.go" target="_blank" rel="noreferrer">https://github.com/duke-git/lancet/blob/main/function/watcher.go</a></li></ul><div STYLE="page-break-after: always;"></div><h2 id="Usage-" tabindex="-1">Usage: <a class="header-anchor" href="#Usage-" aria-label="Permalink to &quot;Usage:&quot;">​</a></h2><div class="language-go vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">go</span><pre class="shiki dracula-soft vp-code-dark"><code><span class="line"><span style="color:#F286C4;">import</span><span style="color:#F6F6F4;"> (</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">github.com/duke-git/lancet/v2/function</span><span style="color:#DEE492;">&quot;</span></span>
<span class="line"><span style="color:#F6F6F4;">)</span></span></code></pre><pre class="shiki vitesse-light vp-code-light"><code><span class="line"><span style="color:#1E754F;">import</span><span style="color:#393A34;"> </span><span style="color:#999999;">(</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B5695999;">&quot;</span><span style="color:#59873A;">github.com/duke-git/lancet/v2/function</span><span style="color:#B5695999;">&quot;</span></span>
<span class="line"><span style="color:#999999;">)</span></span></code></pre></div><div STYLE="page-break-after: always;"></div><h2 id="Index" tabindex="-1">Index <a class="header-anchor" href="#Index" aria-label="Permalink to &quot;Index&quot;">​</a></h2><ul><li><a href="#After">After</a></li><li><a href="#Before">Before</a></li><li><a href="#CurryFn">CurryFn</a></li><li><a href="#Compose">Compose</a></li><li><a href="#Debounced">Debounced</a></li><li><a href="#Delay">Delay</a></li><li><a href="#Schedule">Schedule</a></li><li><a href="#Pipeline">Pipeline</a></li><li><a href="#Watcher">Watcher</a></li></ul><div STYLE="page-break-after: always;"></div><h2 id="Documentation" tabindex="-1">Documentation <a class="header-anchor" href="#Documentation" aria-label="Permalink to &quot;Documentation&quot;">​</a></h2><h3 id="After" tabindex="-1"><span id="After">After</span> <a class="header-anchor" href="#After" aria-label="Permalink to &quot;&lt;span id=&quot;After&quot;&gt;After&lt;/span&gt;&quot;">​</a></h3><p>Creates a function that invokes given func once it&#39;s called n or more times.</p><p><b>Signature:</b></p><div class="language-go vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">go</span><pre class="shiki dracula-soft vp-code-dark"><code><span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> </span><span style="color:#62E884;">After</span><span style="color:#F6F6F4;">(n </span><span style="color:#97E1F1;font-style:italic;">int</span><span style="color:#F6F6F4;">, fn any) </span><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;">(args </span><span style="color:#F286C4;">...</span><span style="color:#F6F6F4;">any) []reflect.Value</span></span></code></pre><pre class="shiki vitesse-light vp-code-light"><code><span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#59873A;">After</span><span style="color:#999999;">(</span><span style="color:#393A34;">n </span><span style="color:#AB5959;">int</span><span style="color:#999999;">,</span><span style="color:#393A34;"> fn any</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">func</span><span style="color:#999999;">(</span><span style="color:#393A34;">args </span><span style="color:#AB5959;">...</span><span style="color:#393A34;">any</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#999999;">[]</span><span style="color:#393A34;">reflect</span><span style="color:#999999;">.</span><span style="color:#393A34;">Value</span></span></code></pre></div><p><b>Example:<span style="float:right;display:inline-block;"><a href="https://go.dev/play/p/eRD5k2vzUVX" target="_blank" rel="noreferrer">Run</a></span></b></p><div class="language-go vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">go</span><pre class="shiki dracula-soft vp-code-dark"><code><span class="line"><span style="color:#F286C4;">package</span><span style="color:#F6F6F4;"> main</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F286C4;">import</span><span style="color:#F6F6F4;"> (</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">fmt</span><span style="color:#DEE492;">&quot;</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">github.com/duke-git/lancet/v2/function</span><span style="color:#DEE492;">&quot;</span></span>
<span class="line"><span style="color:#F6F6F4;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> </span><span style="color:#62E884;">main</span><span style="color:#F6F6F4;">() {</span></span>
<span class="line"><span style="color:#F6F6F4;"> fn </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> function.</span><span style="color:#97E1F1;">After</span><span style="color:#F6F6F4;">(</span><span style="color:#BF9EEE;">2</span><span style="color:#F6F6F4;">, </span><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;">() {</span></span>
<span class="line"><span style="color:#F6F6F4;"> fmt.</span><span style="color:#97E1F1;">Println</span><span style="color:#F6F6F4;">(</span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">hello</span><span style="color:#DEE492;">&quot;</span><span style="color:#F6F6F4;">)</span></span>
<span class="line"><span style="color:#F6F6F4;"> })</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;">fn</span><span style="color:#F6F6F4;">()</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;">fn</span><span style="color:#F6F6F4;">()</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#7B7F8B;">// Output:</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#7B7F8B;">// hello</span></span>
<span class="line"><span style="color:#F6F6F4;">}</span></span></code></pre><pre class="shiki vitesse-light vp-code-light"><code><span class="line"><span style="color:#1E754F;">package</span><span style="color:#393A34;"> </span><span style="color:#59873A;">main</span></span>
<span class="line"></span>
<span class="line"><span style="color:#1E754F;">import</span><span style="color:#393A34;"> </span><span style="color:#999999;">(</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B5695999;">&quot;</span><span style="color:#59873A;">fmt</span><span style="color:#B5695999;">&quot;</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B5695999;">&quot;</span><span style="color:#59873A;">github.com/duke-git/lancet/v2/function</span><span style="color:#B5695999;">&quot;</span></span>
<span class="line"><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#59873A;">main</span><span style="color:#999999;">()</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">fn</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> function</span><span style="color:#999999;">.</span><span style="color:#998418;">After</span><span style="color:#999999;">(</span><span style="color:#2F798A;">2</span><span style="color:#999999;">,</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">func</span><span style="color:#999999;">()</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> fmt</span><span style="color:#999999;">.</span><span style="color:#998418;">Println</span><span style="color:#999999;">(</span><span style="color:#B5695999;">&quot;</span><span style="color:#B56959;">hello</span><span style="color:#B5695999;">&quot;</span><span style="color:#999999;">)</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#999999;">})</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#998418;">fn</span><span style="color:#999999;">()</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#998418;">fn</span><span style="color:#999999;">()</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">// Output:</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">// hello</span></span>
<span class="line"><span style="color:#999999;">}</span></span></code></pre></div><h3 id="Before" tabindex="-1"><span id="Before">Before</span> <a class="header-anchor" href="#Before" aria-label="Permalink to &quot;&lt;span id=&quot;Before&quot;&gt;Before&lt;/span&gt;&quot;">​</a></h3><p>creates a function that invokes func once it&#39;s called less than n times.</p><p><b>Signature:</b></p><div class="language-go vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">go</span><pre class="shiki dracula-soft vp-code-dark"><code><span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> </span><span style="color:#62E884;">Before</span><span style="color:#F6F6F4;">(n </span><span style="color:#97E1F1;font-style:italic;">int</span><span style="color:#F6F6F4;">, fn any) </span><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;">(args </span><span style="color:#F286C4;">...</span><span style="color:#F6F6F4;">any) []reflect.Value</span></span></code></pre><pre class="shiki vitesse-light vp-code-light"><code><span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#59873A;">Before</span><span style="color:#999999;">(</span><span style="color:#393A34;">n </span><span style="color:#AB5959;">int</span><span style="color:#999999;">,</span><span style="color:#393A34;"> fn any</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">func</span><span style="color:#999999;">(</span><span style="color:#393A34;">args </span><span style="color:#AB5959;">...</span><span style="color:#393A34;">any</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#999999;">[]</span><span style="color:#393A34;">reflect</span><span style="color:#999999;">.</span><span style="color:#393A34;">Value</span></span></code></pre></div><p><b>Example:<span style="float:right;display:inline-block;"><a href="https://go.dev/play/p/0HqUDIFZ3IL" target="_blank" rel="noreferrer">Run</a></span></b></p><div class="language-go vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">go</span><pre class="shiki dracula-soft vp-code-dark"><code><span class="line"><span style="color:#F286C4;">package</span><span style="color:#F6F6F4;"> main</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F286C4;">import</span><span style="color:#F6F6F4;"> (</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">fmt</span><span style="color:#DEE492;">&quot;</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">github.com/duke-git/lancet/v2/function</span><span style="color:#DEE492;">&quot;</span></span>
<span class="line"><span style="color:#F6F6F4;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> </span><span style="color:#62E884;">main</span><span style="color:#F6F6F4;">() {</span></span>
<span class="line"><span style="color:#F6F6F4;"> fn </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> function.</span><span style="color:#97E1F1;">Before</span><span style="color:#F6F6F4;">(</span><span style="color:#BF9EEE;">2</span><span style="color:#F6F6F4;">, </span><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;">() {</span></span>
<span class="line"><span style="color:#F6F6F4;"> fmt.</span><span style="color:#97E1F1;">Println</span><span style="color:#F6F6F4;">(</span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">hello</span><span style="color:#DEE492;">&quot;</span><span style="color:#F6F6F4;">)</span></span>
<span class="line"><span style="color:#F6F6F4;"> })</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;">fn</span><span style="color:#F6F6F4;">()</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;">fn</span><span style="color:#F6F6F4;">()</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;">fn</span><span style="color:#F6F6F4;">()</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;">fn</span><span style="color:#F6F6F4;">()</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#7B7F8B;">// Output:</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#7B7F8B;">// hello</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#7B7F8B;">// hello</span></span>
<span class="line"><span style="color:#F6F6F4;">}</span></span></code></pre><pre class="shiki vitesse-light vp-code-light"><code><span class="line"><span style="color:#1E754F;">package</span><span style="color:#393A34;"> </span><span style="color:#59873A;">main</span></span>
<span class="line"></span>
<span class="line"><span style="color:#1E754F;">import</span><span style="color:#393A34;"> </span><span style="color:#999999;">(</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B5695999;">&quot;</span><span style="color:#59873A;">fmt</span><span style="color:#B5695999;">&quot;</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B5695999;">&quot;</span><span style="color:#59873A;">github.com/duke-git/lancet/v2/function</span><span style="color:#B5695999;">&quot;</span></span>
<span class="line"><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#59873A;">main</span><span style="color:#999999;">()</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">fn</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> function</span><span style="color:#999999;">.</span><span style="color:#998418;">Before</span><span style="color:#999999;">(</span><span style="color:#2F798A;">2</span><span style="color:#999999;">,</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">func</span><span style="color:#999999;">()</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> fmt</span><span style="color:#999999;">.</span><span style="color:#998418;">Println</span><span style="color:#999999;">(</span><span style="color:#B5695999;">&quot;</span><span style="color:#B56959;">hello</span><span style="color:#B5695999;">&quot;</span><span style="color:#999999;">)</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#999999;">})</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#998418;">fn</span><span style="color:#999999;">()</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#998418;">fn</span><span style="color:#999999;">()</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#998418;">fn</span><span style="color:#999999;">()</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#998418;">fn</span><span style="color:#999999;">()</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">// Output:</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">// hello</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">// hello</span></span>
<span class="line"><span style="color:#999999;">}</span></span></code></pre></div><h3 id="CurryFn" tabindex="-1"><span id="CurryFn">CurryFn</span> <a class="header-anchor" href="#CurryFn" aria-label="Permalink to &quot;&lt;span id=&quot;CurryFn&quot;&gt;CurryFn&lt;/span&gt;&quot;">​</a></h3><p>Make curry function.</p><p><b>Signature:</b></p><div class="language-go vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">go</span><pre class="shiki dracula-soft vp-code-dark"><code><span class="line"><span style="color:#F286C4;">type</span><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;font-style:italic;">CurryFn</span><span style="color:#F6F6F4;">[T any] </span><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;">(</span><span style="color:#F286C4;">...</span><span style="color:#F6F6F4;">T) T</span></span>
<span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> (cf CurryFn[T]) </span><span style="color:#62E884;">New</span><span style="color:#F6F6F4;">(val T) </span><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;">(</span><span style="color:#F286C4;">...</span><span style="color:#F6F6F4;">T) T</span></span></code></pre><pre class="shiki vitesse-light vp-code-light"><code><span class="line"><span style="color:#1E754F;">type</span><span style="color:#393A34;"> </span><span style="color:#2E8F82;">CurryFn</span><span style="color:#999999;">[</span><span style="color:#393A34;">T any</span><span style="color:#999999;">]</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">func</span><span style="color:#999999;">(</span><span style="color:#AB5959;">...</span><span style="color:#393A34;">T</span><span style="color:#999999;">)</span><span style="color:#393A34;"> T</span></span>
<span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#999999;">(</span><span style="color:#393A34;">cf CurryFn</span><span style="color:#999999;">[</span><span style="color:#393A34;">T</span><span style="color:#999999;">])</span><span style="color:#393A34;"> </span><span style="color:#59873A;">New</span><span style="color:#999999;">(</span><span style="color:#393A34;">val T</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">func</span><span style="color:#999999;">(</span><span style="color:#AB5959;">...</span><span style="color:#393A34;">T</span><span style="color:#999999;">)</span><span style="color:#393A34;"> T</span></span></code></pre></div><p><b>Example:<span style="float:right;display:inline-block;"><a href="https://go.dev/play/p/5HopfDwANKX" target="_blank" rel="noreferrer">Run</a></span></b></p><div class="language-go vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">go</span><pre class="shiki dracula-soft vp-code-dark"><code><span class="line"><span style="color:#F286C4;">package</span><span style="color:#F6F6F4;"> main</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F286C4;">import</span><span style="color:#F6F6F4;"> (</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">fmt</span><span style="color:#DEE492;">&quot;</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">github.com/duke-git/lancet/v2/function</span><span style="color:#DEE492;">&quot;</span></span>
<span class="line"><span style="color:#F6F6F4;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> </span><span style="color:#62E884;">main</span><span style="color:#F6F6F4;">() {</span></span>
<span class="line"><span style="color:#F6F6F4;"> add </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;">(a, b </span><span style="color:#97E1F1;font-style:italic;">int</span><span style="color:#F6F6F4;">) </span><span style="color:#97E1F1;font-style:italic;">int</span><span style="color:#F6F6F4;"> {</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">return</span><span style="color:#F6F6F4;"> a </span><span style="color:#F286C4;">+</span><span style="color:#F6F6F4;"> b</span></span>
<span class="line"><span style="color:#F6F6F4;"> }</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">var</span><span style="color:#F6F6F4;"> addCurry function.CurryFn[</span><span style="color:#97E1F1;font-style:italic;">int</span><span style="color:#F6F6F4;">] </span><span style="color:#F286C4;">=</span><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;">(values </span><span style="color:#F286C4;">...</span><span style="color:#97E1F1;font-style:italic;">int</span><span style="color:#F6F6F4;">) </span><span style="color:#97E1F1;font-style:italic;">int</span><span style="color:#F6F6F4;"> {</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">return</span><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;">add</span><span style="color:#F6F6F4;">(values[</span><span style="color:#BF9EEE;">0</span><span style="color:#F6F6F4;">], values[</span><span style="color:#BF9EEE;">1</span><span style="color:#F6F6F4;">])</span></span>
<span class="line"><span style="color:#F6F6F4;"> }</span></span>
<span class="line"><span style="color:#F6F6F4;"> add1 </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> addCurry.</span><span style="color:#97E1F1;">New</span><span style="color:#F6F6F4;">(</span><span style="color:#BF9EEE;">1</span><span style="color:#F6F6F4;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> result </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;">add1</span><span style="color:#F6F6F4;">(</span><span style="color:#BF9EEE;">2</span><span style="color:#F6F6F4;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> fmt.</span><span style="color:#97E1F1;">Println</span><span style="color:#F6F6F4;">(result)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#7B7F8B;">// Output:</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#7B7F8B;">// 3</span></span>
<span class="line"><span style="color:#F6F6F4;">}</span></span></code></pre><pre class="shiki vitesse-light vp-code-light"><code><span class="line"><span style="color:#1E754F;">package</span><span style="color:#393A34;"> </span><span style="color:#59873A;">main</span></span>
<span class="line"></span>
<span class="line"><span style="color:#1E754F;">import</span><span style="color:#393A34;"> </span><span style="color:#999999;">(</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B5695999;">&quot;</span><span style="color:#59873A;">fmt</span><span style="color:#B5695999;">&quot;</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B5695999;">&quot;</span><span style="color:#59873A;">github.com/duke-git/lancet/v2/function</span><span style="color:#B5695999;">&quot;</span></span>
<span class="line"><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#59873A;">main</span><span style="color:#999999;">()</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">add</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">func</span><span style="color:#999999;">(</span><span style="color:#393A34;">a</span><span style="color:#999999;">,</span><span style="color:#393A34;"> b </span><span style="color:#AB5959;">int</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#AB5959;">int</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#1E754F;">return</span><span style="color:#393A34;"> a </span><span style="color:#AB5959;">+</span><span style="color:#393A34;"> b</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#999999;">}</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#1E754F;">var</span><span style="color:#393A34;"> </span><span style="color:#B07D48;">addCurry</span><span style="color:#393A34;"> function</span><span style="color:#999999;">.</span><span style="color:#393A34;">CurryFn</span><span style="color:#999999;">[</span><span style="color:#AB5959;">int</span><span style="color:#999999;">]</span><span style="color:#393A34;"> </span><span style="color:#999999;">=</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">func</span><span style="color:#999999;">(</span><span style="color:#393A34;">values </span><span style="color:#AB5959;">...int</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#AB5959;">int</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#1E754F;">return</span><span style="color:#393A34;"> </span><span style="color:#998418;">add</span><span style="color:#999999;">(</span><span style="color:#393A34;">values</span><span style="color:#999999;">[</span><span style="color:#2F798A;">0</span><span style="color:#999999;">],</span><span style="color:#393A34;"> values</span><span style="color:#999999;">[</span><span style="color:#2F798A;">1</span><span style="color:#999999;">])</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#999999;">}</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">add1</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> addCurry</span><span style="color:#999999;">.</span><span style="color:#998418;">New</span><span style="color:#999999;">(</span><span style="color:#2F798A;">1</span><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">result</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> </span><span style="color:#998418;">add1</span><span style="color:#999999;">(</span><span style="color:#2F798A;">2</span><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> fmt</span><span style="color:#999999;">.</span><span style="color:#998418;">Println</span><span style="color:#999999;">(</span><span style="color:#393A34;">result</span><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">// Output:</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">// 3</span></span>
<span class="line"><span style="color:#393A34;">}</span></span></code></pre></div><h3 id="Compose" tabindex="-1"><span id="Compose">Compose</span> <a class="header-anchor" href="#Compose" aria-label="Permalink to &quot;&lt;span id=&quot;Compose&quot;&gt;Compose&lt;/span&gt;&quot;">​</a></h3><p>Compose the function list from right to left, then return the composed function.</p><p><b>Signature:</b></p><div class="language-go vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">go</span><pre class="shiki dracula-soft vp-code-dark"><code><span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> Compose[T any](fnList </span><span style="color:#F286C4;">...func</span><span style="color:#F6F6F4;">(</span><span style="color:#F286C4;">...</span><span style="color:#F6F6F4;">T) T) </span><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;">(</span><span style="color:#F286C4;">...</span><span style="color:#F6F6F4;">T) T</span></span></code></pre><pre class="shiki vitesse-light vp-code-light"><code><span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> Compose</span><span style="color:#999999;">[</span><span style="color:#393A34;">T any</span><span style="color:#999999;">](</span><span style="color:#393A34;">fnList </span><span style="color:#AB5959;">...</span><span style="color:#1E754F;">func</span><span style="color:#999999;">(</span><span style="color:#AB5959;">...</span><span style="color:#393A34;">T</span><span style="color:#999999;">)</span><span style="color:#393A34;"> T</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">func</span><span style="color:#999999;">(</span><span style="color:#AB5959;">...</span><span style="color:#393A34;">T</span><span style="color:#999999;">)</span><span style="color:#393A34;"> T</span></span></code></pre></div><p><b>Example:<span style="float:right;display:inline-block;"><a href="https://go.dev/play/p/KKfugD4PKYF" target="_blank" rel="noreferrer">Run</a></span></b></p><div class="language-go vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">go</span><pre class="shiki dracula-soft vp-code-dark"><code><span class="line"><span style="color:#F286C4;">package</span><span style="color:#F6F6F4;"> main</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F286C4;">import</span><span style="color:#F6F6F4;"> (</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">fmt</span><span style="color:#DEE492;">&quot;</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">github.com/duke-git/lancet/v2/function</span><span style="color:#DEE492;">&quot;</span></span>
<span class="line"><span style="color:#F6F6F4;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> </span><span style="color:#62E884;">main</span><span style="color:#F6F6F4;">() {</span></span>
<span class="line"><span style="color:#F6F6F4;"> toUpper </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;">(strs </span><span style="color:#F286C4;">...</span><span style="color:#97E1F1;font-style:italic;">string</span><span style="color:#F6F6F4;">) </span><span style="color:#97E1F1;font-style:italic;">string</span><span style="color:#F6F6F4;"> {</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">return</span><span style="color:#F6F6F4;"> strings.</span><span style="color:#97E1F1;">ToUpper</span><span style="color:#F6F6F4;">(strs[</span><span style="color:#BF9EEE;">0</span><span style="color:#F6F6F4;">])</span></span>
<span class="line"><span style="color:#F6F6F4;"> }</span></span>
<span class="line"><span style="color:#F6F6F4;"> toLower </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;">(strs </span><span style="color:#F286C4;">...</span><span style="color:#97E1F1;font-style:italic;">string</span><span style="color:#F6F6F4;">) </span><span style="color:#97E1F1;font-style:italic;">string</span><span style="color:#F6F6F4;"> {</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">return</span><span style="color:#F6F6F4;"> strings.</span><span style="color:#97E1F1;">ToLower</span><span style="color:#F6F6F4;">(strs[</span><span style="color:#BF9EEE;">0</span><span style="color:#F6F6F4;">])</span></span>
<span class="line"><span style="color:#F6F6F4;"> }</span></span>
<span class="line"><span style="color:#F6F6F4;"> transform </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> function.</span><span style="color:#97E1F1;">Compose</span><span style="color:#F6F6F4;">(toUpper, toLower)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> result </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;">transform</span><span style="color:#F6F6F4;">(</span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">aBCde</span><span style="color:#DEE492;">&quot;</span><span style="color:#F6F6F4;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> fmt.</span><span style="color:#97E1F1;">Println</span><span style="color:#F6F6F4;">(result)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#7B7F8B;">// Output:</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#7B7F8B;">// ABCDE</span></span>
<span class="line"><span style="color:#F6F6F4;">}</span></span></code></pre><pre class="shiki vitesse-light vp-code-light"><code><span class="line"><span style="color:#1E754F;">package</span><span style="color:#393A34;"> </span><span style="color:#59873A;">main</span></span>
<span class="line"></span>
<span class="line"><span style="color:#1E754F;">import</span><span style="color:#393A34;"> </span><span style="color:#999999;">(</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B5695999;">&quot;</span><span style="color:#59873A;">fmt</span><span style="color:#B5695999;">&quot;</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B5695999;">&quot;</span><span style="color:#59873A;">github.com/duke-git/lancet/v2/function</span><span style="color:#B5695999;">&quot;</span></span>
<span class="line"><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#59873A;">main</span><span style="color:#999999;">()</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">toUpper</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">func</span><span style="color:#999999;">(</span><span style="color:#393A34;">strs </span><span style="color:#AB5959;">...</span><span style="color:#AB5959;">string</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#AB5959;">string</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#1E754F;">return</span><span style="color:#393A34;"> strings</span><span style="color:#999999;">.</span><span style="color:#998418;">ToUpper</span><span style="color:#999999;">(</span><span style="color:#393A34;">strs</span><span style="color:#999999;">[</span><span style="color:#2F798A;">0</span><span style="color:#999999;">])</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#999999;">}</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">toLower</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">func</span><span style="color:#999999;">(</span><span style="color:#393A34;">strs </span><span style="color:#AB5959;">...</span><span style="color:#AB5959;">string</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#AB5959;">string</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#1E754F;">return</span><span style="color:#393A34;"> strings</span><span style="color:#999999;">.</span><span style="color:#998418;">ToLower</span><span style="color:#999999;">(</span><span style="color:#393A34;">strs</span><span style="color:#999999;">[</span><span style="color:#2F798A;">0</span><span style="color:#999999;">])</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#999999;">}</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">transform</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> function</span><span style="color:#999999;">.</span><span style="color:#998418;">Compose</span><span style="color:#999999;">(</span><span style="color:#393A34;">toUpper</span><span style="color:#999999;">,</span><span style="color:#393A34;"> toLower</span><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">result</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> </span><span style="color:#998418;">transform</span><span style="color:#999999;">(</span><span style="color:#B5695999;">&quot;</span><span style="color:#B56959;">aBCde</span><span style="color:#B5695999;">&quot;</span><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> fmt</span><span style="color:#999999;">.</span><span style="color:#998418;">Println</span><span style="color:#999999;">(</span><span style="color:#393A34;">result</span><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">// Output:</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">// ABCDE</span></span>
<span class="line"><span style="color:#999999;">}</span></span></code></pre></div><h3 id="Debounced" tabindex="-1"><span id="Debounced">Debounced</span> <a class="header-anchor" href="#Debounced" aria-label="Permalink to &quot;&lt;span id=&quot;Debounced&quot;&gt;Debounced&lt;/span&gt;&quot;">​</a></h3><p>Creates a debounced function that delays invoking fn until after wait duration have elapsed since the last time the debounced function was invoked.</p><p><b>Signature:</b></p><div class="language-go vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">go</span><pre class="shiki dracula-soft vp-code-dark"><code><span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> </span><span style="color:#62E884;">Debounced</span><span style="color:#F6F6F4;">(fn </span><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;">(), duration time.Duration) </span><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;">()</span></span></code></pre><pre class="shiki vitesse-light vp-code-light"><code><span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#59873A;">Debounced</span><span style="color:#999999;">(</span><span style="color:#393A34;">fn </span><span style="color:#1E754F;">func</span><span style="color:#999999;">(),</span><span style="color:#393A34;"> duration time</span><span style="color:#999999;">.</span><span style="color:#393A34;">Duration</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">func</span><span style="color:#999999;">()</span></span></code></pre></div><p><b>Example:<span style="float:right;display:inline-block;"><a href="https://go.dev/play/p/absuEGB_GN7" target="_blank" rel="noreferrer">Run</a></span></b></p><div class="language-go vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">go</span><pre class="shiki dracula-soft vp-code-dark"><code><span class="line"><span style="color:#F286C4;">package</span><span style="color:#F6F6F4;"> main</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F286C4;">import</span><span style="color:#F6F6F4;"> (</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">fmt</span><span style="color:#DEE492;">&quot;</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">github.com/duke-git/lancet/v2/function</span><span style="color:#DEE492;">&quot;</span></span>
<span class="line"><span style="color:#F6F6F4;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> </span><span style="color:#62E884;">main</span><span style="color:#F6F6F4;">() {</span></span>
<span class="line"><span style="color:#F6F6F4;"> count </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> </span><span style="color:#BF9EEE;">0</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> add </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;">() {</span></span>
<span class="line"><span style="color:#F6F6F4;"> count</span><span style="color:#F286C4;">++</span></span>
<span class="line"><span style="color:#F6F6F4;"> }</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> debouncedAdd </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> function.</span><span style="color:#97E1F1;">Debounced</span><span style="color:#F6F6F4;">(add, </span><span style="color:#BF9EEE;">50</span><span style="color:#F286C4;">*</span><span style="color:#F6F6F4;">time.Microsecond)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;">debouncedAdd</span><span style="color:#F6F6F4;">()</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;">debouncedAdd</span><span style="color:#F6F6F4;">()</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;">debouncedAdd</span><span style="color:#F6F6F4;">()</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;">debouncedAdd</span><span style="color:#F6F6F4;">()</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> time.</span><span style="color:#97E1F1;">Sleep</span><span style="color:#F6F6F4;">(</span><span style="color:#BF9EEE;">100</span><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">*</span><span style="color:#F6F6F4;"> time.Millisecond)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> fmt.</span><span style="color:#97E1F1;">Println</span><span style="color:#F6F6F4;">(count)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;">debouncedAdd</span><span style="color:#F6F6F4;">()</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> time.</span><span style="color:#97E1F1;">Sleep</span><span style="color:#F6F6F4;">(</span><span style="color:#BF9EEE;">100</span><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">*</span><span style="color:#F6F6F4;"> time.Millisecond)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> fmt.</span><span style="color:#97E1F1;">Println</span><span style="color:#F6F6F4;">(count)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#7B7F8B;">// Output:</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#7B7F8B;">// 1</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#7B7F8B;">// 2</span></span>
<span class="line"><span style="color:#F6F6F4;">}</span></span></code></pre><pre class="shiki vitesse-light vp-code-light"><code><span class="line"><span style="color:#1E754F;">package</span><span style="color:#393A34;"> </span><span style="color:#59873A;">main</span></span>
<span class="line"></span>
<span class="line"><span style="color:#1E754F;">import</span><span style="color:#393A34;"> </span><span style="color:#999999;">(</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B5695999;">&quot;</span><span style="color:#59873A;">fmt</span><span style="color:#B5695999;">&quot;</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B5695999;">&quot;</span><span style="color:#59873A;">github.com/duke-git/lancet/v2/function</span><span style="color:#B5695999;">&quot;</span></span>
<span class="line"><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#59873A;">main</span><span style="color:#999999;">()</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">count</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> </span><span style="color:#2F798A;">0</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">add</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">func</span><span style="color:#999999;">()</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> count</span><span style="color:#AB5959;">++</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#999999;">}</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">debouncedAdd</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> function</span><span style="color:#999999;">.</span><span style="color:#998418;">Debounced</span><span style="color:#999999;">(</span><span style="color:#393A34;">add</span><span style="color:#999999;">,</span><span style="color:#393A34;"> </span><span style="color:#2F798A;">50</span><span style="color:#AB5959;">*</span><span style="color:#393A34;">time</span><span style="color:#999999;">.</span><span style="color:#393A34;">Microsecond</span><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#998418;">debouncedAdd</span><span style="color:#999999;">()</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#998418;">debouncedAdd</span><span style="color:#999999;">()</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#998418;">debouncedAdd</span><span style="color:#999999;">()</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#998418;">debouncedAdd</span><span style="color:#999999;">()</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> time</span><span style="color:#999999;">.</span><span style="color:#998418;">Sleep</span><span style="color:#999999;">(</span><span style="color:#2F798A;">100</span><span style="color:#393A34;"> </span><span style="color:#AB5959;">*</span><span style="color:#393A34;"> time</span><span style="color:#999999;">.</span><span style="color:#393A34;">Millisecond</span><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> fmt</span><span style="color:#999999;">.</span><span style="color:#998418;">Println</span><span style="color:#999999;">(</span><span style="color:#393A34;">count</span><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#998418;">debouncedAdd</span><span style="color:#999999;">()</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> time</span><span style="color:#999999;">.</span><span style="color:#998418;">Sleep</span><span style="color:#999999;">(</span><span style="color:#2F798A;">100</span><span style="color:#393A34;"> </span><span style="color:#AB5959;">*</span><span style="color:#393A34;"> time</span><span style="color:#999999;">.</span><span style="color:#393A34;">Millisecond</span><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> fmt</span><span style="color:#999999;">.</span><span style="color:#998418;">Println</span><span style="color:#999999;">(</span><span style="color:#393A34;">count</span><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">// Output:</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">// 1</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">// 2</span></span>
<span class="line"><span style="color:#999999;">}</span></span></code></pre></div><h3 id="Delay" tabindex="-1"><span id="Delay">Delay</span> <a class="header-anchor" href="#Delay" aria-label="Permalink to &quot;&lt;span id=&quot;Delay&quot;&gt;Delay&lt;/span&gt;&quot;">​</a></h3><p>Invoke function after delayed time.</p><p><b>Signature:</b></p><div class="language-go vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">go</span><pre class="shiki dracula-soft vp-code-dark"><code><span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> </span><span style="color:#62E884;">Delay</span><span style="color:#F6F6F4;">(delay time.Duration, fn any, args </span><span style="color:#F286C4;">...</span><span style="color:#F6F6F4;">any)</span></span></code></pre><pre class="shiki vitesse-light vp-code-light"><code><span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#59873A;">Delay</span><span style="color:#999999;">(</span><span style="color:#393A34;">delay time</span><span style="color:#999999;">.</span><span style="color:#393A34;">Duration</span><span style="color:#999999;">,</span><span style="color:#393A34;"> fn any</span><span style="color:#999999;">,</span><span style="color:#393A34;"> args </span><span style="color:#AB5959;">...</span><span style="color:#393A34;">any</span><span style="color:#999999;">)</span></span></code></pre></div><p><b>Example:<span style="float:right;display:inline-block;"><a href="https://go.dev/play/p/Ivtc2ZE-Tye" target="_blank" rel="noreferrer">Run</a></span></b></p><div class="language-go vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">go</span><pre class="shiki dracula-soft vp-code-dark"><code><span class="line"><span style="color:#F286C4;">package</span><span style="color:#F6F6F4;"> main</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F286C4;">import</span><span style="color:#F6F6F4;"> (</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">fmt</span><span style="color:#DEE492;">&quot;</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">github.com/duke-git/lancet/v2/function</span><span style="color:#DEE492;">&quot;</span></span>
<span class="line"><span style="color:#F6F6F4;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> </span><span style="color:#62E884;">main</span><span style="color:#F6F6F4;">() {</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">var</span><span style="color:#F6F6F4;"> print </span><span style="color:#F286C4;">=</span><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;">(s </span><span style="color:#97E1F1;font-style:italic;">string</span><span style="color:#F6F6F4;">) {</span></span>
<span class="line"><span style="color:#F6F6F4;"> fmt.</span><span style="color:#97E1F1;">Println</span><span style="color:#F6F6F4;">(s)</span></span>
<span class="line"><span style="color:#F6F6F4;"> }</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> function.</span><span style="color:#97E1F1;">Delay</span><span style="color:#F6F6F4;">(</span><span style="color:#BF9EEE;">2</span><span style="color:#F286C4;">*</span><span style="color:#F6F6F4;">time.Second, print, </span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">hello</span><span style="color:#DEE492;">&quot;</span><span style="color:#F6F6F4;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#7B7F8B;">// Output:</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#7B7F8B;">// hello</span></span>
<span class="line"><span style="color:#F6F6F4;">}</span></span></code></pre><pre class="shiki vitesse-light vp-code-light"><code><span class="line"><span style="color:#1E754F;">package</span><span style="color:#393A34;"> </span><span style="color:#59873A;">main</span></span>
<span class="line"></span>
<span class="line"><span style="color:#1E754F;">import</span><span style="color:#393A34;"> </span><span style="color:#999999;">(</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B5695999;">&quot;</span><span style="color:#59873A;">fmt</span><span style="color:#B5695999;">&quot;</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B5695999;">&quot;</span><span style="color:#59873A;">github.com/duke-git/lancet/v2/function</span><span style="color:#B5695999;">&quot;</span></span>
<span class="line"><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#59873A;">main</span><span style="color:#999999;">()</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#1E754F;">var</span><span style="color:#393A34;"> </span><span style="color:#B07D48;">print</span><span style="color:#393A34;"> </span><span style="color:#999999;">=</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">func</span><span style="color:#999999;">(</span><span style="color:#393A34;">s </span><span style="color:#AB5959;">string</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> fmt</span><span style="color:#999999;">.</span><span style="color:#998418;">Println</span><span style="color:#999999;">(</span><span style="color:#393A34;">s</span><span style="color:#999999;">)</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#999999;">}</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> function</span><span style="color:#999999;">.</span><span style="color:#998418;">Delay</span><span style="color:#999999;">(</span><span style="color:#2F798A;">2</span><span style="color:#AB5959;">*</span><span style="color:#393A34;">time</span><span style="color:#999999;">.</span><span style="color:#393A34;">Second</span><span style="color:#999999;">,</span><span style="color:#393A34;"> print</span><span style="color:#999999;">,</span><span style="color:#393A34;"> </span><span style="color:#B5695999;">&quot;</span><span style="color:#B56959;">hello</span><span style="color:#B5695999;">&quot;</span><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">// Output:</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">// hello</span></span>
<span class="line"><span style="color:#999999;">}</span></span></code></pre></div><h3 id="Schedule" tabindex="-1"><span id="Schedule">Schedule</span> <a class="header-anchor" href="#Schedule" aria-label="Permalink to &quot;&lt;span id=&quot;Schedule&quot;&gt;Schedule&lt;/span&gt;&quot;">​</a></h3><p>Invoke function every duration time, until close the returned bool chan.</p><p><b>Signature:</b></p><div class="language-go vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">go</span><pre class="shiki dracula-soft vp-code-dark"><code><span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> </span><span style="color:#62E884;">Schedule</span><span style="color:#F6F6F4;">(d time.Duration, fn any, args </span><span style="color:#F286C4;">...</span><span style="color:#F6F6F4;">any) </span><span style="color:#F286C4;">chan</span><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;font-style:italic;">bool</span></span></code></pre><pre class="shiki vitesse-light vp-code-light"><code><span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#59873A;">Schedule</span><span style="color:#999999;">(</span><span style="color:#393A34;">d time</span><span style="color:#999999;">.</span><span style="color:#393A34;">Duration</span><span style="color:#999999;">,</span><span style="color:#393A34;"> fn any</span><span style="color:#999999;">,</span><span style="color:#393A34;"> args </span><span style="color:#AB5959;">...</span><span style="color:#393A34;">any</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">chan</span><span style="color:#393A34;"> </span><span style="color:#AB5959;">bool</span></span></code></pre></div><p><b>Example:<span style="float:right;display:inline-block;"><a href="https://go.dev/play/p/hbON-Xeyn5N" target="_blank" rel="noreferrer">Run</a></span></b></p><div class="language-go vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">go</span><pre class="shiki dracula-soft vp-code-dark"><code><span class="line"><span style="color:#F286C4;">package</span><span style="color:#F6F6F4;"> main</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F286C4;">import</span><span style="color:#F6F6F4;"> (</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">fmt</span><span style="color:#DEE492;">&quot;</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">github.com/duke-git/lancet/v2/function</span><span style="color:#DEE492;">&quot;</span></span>
<span class="line"><span style="color:#F6F6F4;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> </span><span style="color:#62E884;">main</span><span style="color:#F6F6F4;">() {</span></span>
<span class="line"><span style="color:#F6F6F4;"> count </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> </span><span style="color:#BF9EEE;">0</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> increase </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;">() {</span></span>
<span class="line"><span style="color:#F6F6F4;"> count</span><span style="color:#F286C4;">++</span></span>
<span class="line"><span style="color:#F6F6F4;"> }</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> stop </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> function.</span><span style="color:#97E1F1;">Schedule</span><span style="color:#F6F6F4;">(</span><span style="color:#BF9EEE;">2</span><span style="color:#F286C4;">*</span><span style="color:#F6F6F4;">time.Second, increase)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> time.</span><span style="color:#97E1F1;">Sleep</span><span style="color:#F6F6F4;">(</span><span style="color:#BF9EEE;">2</span><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">*</span><span style="color:#F6F6F4;"> time.Second)</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;">close</span><span style="color:#F6F6F4;">(stop)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> fmt.</span><span style="color:#97E1F1;">Println</span><span style="color:#F6F6F4;">(count)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#7B7F8B;">// Output:</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#7B7F8B;">// 2</span></span>
<span class="line"><span style="color:#F6F6F4;">}</span></span></code></pre><pre class="shiki vitesse-light vp-code-light"><code><span class="line"><span style="color:#1E754F;">package</span><span style="color:#393A34;"> </span><span style="color:#59873A;">main</span></span>
<span class="line"></span>
<span class="line"><span style="color:#1E754F;">import</span><span style="color:#393A34;"> </span><span style="color:#999999;">(</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B5695999;">&quot;</span><span style="color:#59873A;">fmt</span><span style="color:#B5695999;">&quot;</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B5695999;">&quot;</span><span style="color:#59873A;">github.com/duke-git/lancet/v2/function</span><span style="color:#B5695999;">&quot;</span></span>
<span class="line"><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#59873A;">main</span><span style="color:#999999;">()</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">count</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> </span><span style="color:#2F798A;">0</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">increase</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">func</span><span style="color:#999999;">()</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> count</span><span style="color:#AB5959;">++</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#999999;">}</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">stop</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> function</span><span style="color:#999999;">.</span><span style="color:#998418;">Schedule</span><span style="color:#999999;">(</span><span style="color:#2F798A;">2</span><span style="color:#AB5959;">*</span><span style="color:#393A34;">time</span><span style="color:#999999;">.</span><span style="color:#393A34;">Second</span><span style="color:#999999;">,</span><span style="color:#393A34;"> increase</span><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> time</span><span style="color:#999999;">.</span><span style="color:#998418;">Sleep</span><span style="color:#999999;">(</span><span style="color:#2F798A;">2</span><span style="color:#393A34;"> </span><span style="color:#AB5959;">*</span><span style="color:#393A34;"> time</span><span style="color:#999999;">.</span><span style="color:#393A34;">Second</span><span style="color:#999999;">)</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#998418;">close</span><span style="color:#999999;">(</span><span style="color:#393A34;">stop</span><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> fmt</span><span style="color:#999999;">.</span><span style="color:#998418;">Println</span><span style="color:#999999;">(</span><span style="color:#393A34;">count</span><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">// Output:</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">// 2</span></span>
<span class="line"><span style="color:#999999;">}</span></span></code></pre></div><h3 id="Pipeline" tabindex="-1"><span id="Pipeline">Pipeline</span> <a class="header-anchor" href="#Pipeline" aria-label="Permalink to &quot;&lt;span id=&quot;Pipeline&quot;&gt;Pipeline&lt;/span&gt;&quot;">​</a></h3><p>Pipeline takes a list of functions and returns a function whose param will be passed into the functions one by one.</p><p><b>Signature:</b></p><div class="language-go vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">go</span><pre class="shiki dracula-soft vp-code-dark"><code><span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> Pipeline[T any](funcs </span><span style="color:#F286C4;">...func</span><span style="color:#F6F6F4;">(T) T) </span><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;">(T) T</span></span></code></pre><pre class="shiki vitesse-light vp-code-light"><code><span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> Pipeline</span><span style="color:#999999;">[</span><span style="color:#393A34;">T any</span><span style="color:#999999;">](</span><span style="color:#393A34;">funcs </span><span style="color:#AB5959;">...</span><span style="color:#1E754F;">func</span><span style="color:#999999;">(</span><span style="color:#393A34;">T</span><span style="color:#999999;">)</span><span style="color:#393A34;"> T</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">func</span><span style="color:#999999;">(</span><span style="color:#393A34;">T</span><span style="color:#999999;">)</span><span style="color:#393A34;"> T</span></span></code></pre></div><p><b>Example:<span style="float:right;display:inline-block;"><a href="https://go.dev/play/p/mPdUVvj6HD6" target="_blank" rel="noreferrer">Run</a></span></b></p><div class="language-go vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">go</span><pre class="shiki dracula-soft vp-code-dark"><code><span class="line"><span style="color:#F286C4;">package</span><span style="color:#F6F6F4;"> main</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F286C4;">import</span><span style="color:#F6F6F4;"> (</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">fmt</span><span style="color:#DEE492;">&quot;</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">github.com/duke-git/lancet/v2/function</span><span style="color:#DEE492;">&quot;</span></span>
<span class="line"><span style="color:#F6F6F4;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> </span><span style="color:#62E884;">main</span><span style="color:#F6F6F4;">() {</span></span>
<span class="line"><span style="color:#F6F6F4;"> addOne </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;">(x </span><span style="color:#97E1F1;font-style:italic;">int</span><span style="color:#F6F6F4;">) </span><span style="color:#97E1F1;font-style:italic;">int</span><span style="color:#F6F6F4;"> {</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">return</span><span style="color:#F6F6F4;"> x </span><span style="color:#F286C4;">+</span><span style="color:#F6F6F4;"> </span><span style="color:#BF9EEE;">1</span></span>
<span class="line"><span style="color:#F6F6F4;"> }</span></span>
<span class="line"><span style="color:#F6F6F4;"> double </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;">(x </span><span style="color:#97E1F1;font-style:italic;">int</span><span style="color:#F6F6F4;">) </span><span style="color:#97E1F1;font-style:italic;">int</span><span style="color:#F6F6F4;"> {</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">return</span><span style="color:#F6F6F4;"> </span><span style="color:#BF9EEE;">2</span><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">*</span><span style="color:#F6F6F4;"> x</span></span>
<span class="line"><span style="color:#F6F6F4;"> }</span></span>
<span class="line"><span style="color:#F6F6F4;"> square </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;">(x </span><span style="color:#97E1F1;font-style:italic;">int</span><span style="color:#F6F6F4;">) </span><span style="color:#97E1F1;font-style:italic;">int</span><span style="color:#F6F6F4;"> {</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">return</span><span style="color:#F6F6F4;"> x </span><span style="color:#F286C4;">*</span><span style="color:#F6F6F4;"> x</span></span>
<span class="line"><span style="color:#F6F6F4;"> }</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> fn </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> function.</span><span style="color:#97E1F1;">Pipeline</span><span style="color:#F6F6F4;">(addOne, double, square)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> result </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;">fn</span><span style="color:#F6F6F4;">(</span><span style="color:#BF9EEE;">2</span><span style="color:#F6F6F4;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> fmt.</span><span style="color:#97E1F1;">Println</span><span style="color:#F6F6F4;">(result)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#7B7F8B;">// Output:</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#7B7F8B;">// 36</span></span>
<span class="line"><span style="color:#F6F6F4;">}</span></span></code></pre><pre class="shiki vitesse-light vp-code-light"><code><span class="line"><span style="color:#1E754F;">package</span><span style="color:#393A34;"> </span><span style="color:#59873A;">main</span></span>
<span class="line"></span>
<span class="line"><span style="color:#1E754F;">import</span><span style="color:#393A34;"> </span><span style="color:#999999;">(</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B5695999;">&quot;</span><span style="color:#59873A;">fmt</span><span style="color:#B5695999;">&quot;</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B5695999;">&quot;</span><span style="color:#59873A;">github.com/duke-git/lancet/v2/function</span><span style="color:#B5695999;">&quot;</span></span>
<span class="line"><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#59873A;">main</span><span style="color:#999999;">()</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">addOne</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">func</span><span style="color:#999999;">(</span><span style="color:#393A34;">x </span><span style="color:#AB5959;">int</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#AB5959;">int</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#1E754F;">return</span><span style="color:#393A34;"> x </span><span style="color:#AB5959;">+</span><span style="color:#393A34;"> </span><span style="color:#2F798A;">1</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#999999;">}</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">double</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">func</span><span style="color:#999999;">(</span><span style="color:#393A34;">x </span><span style="color:#AB5959;">int</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#AB5959;">int</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#1E754F;">return</span><span style="color:#393A34;"> </span><span style="color:#2F798A;">2</span><span style="color:#393A34;"> </span><span style="color:#AB5959;">*</span><span style="color:#393A34;"> x</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#999999;">}</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">square</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">func</span><span style="color:#999999;">(</span><span style="color:#393A34;">x </span><span style="color:#AB5959;">int</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#AB5959;">int</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#1E754F;">return</span><span style="color:#393A34;"> x </span><span style="color:#AB5959;">*</span><span style="color:#393A34;"> x</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#999999;">}</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">fn</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> function</span><span style="color:#999999;">.</span><span style="color:#998418;">Pipeline</span><span style="color:#999999;">(</span><span style="color:#393A34;">addOne</span><span style="color:#999999;">,</span><span style="color:#393A34;"> double</span><span style="color:#999999;">,</span><span style="color:#393A34;"> square</span><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">result</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> </span><span style="color:#998418;">fn</span><span style="color:#999999;">(</span><span style="color:#2F798A;">2</span><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> fmt</span><span style="color:#999999;">.</span><span style="color:#998418;">Println</span><span style="color:#999999;">(</span><span style="color:#393A34;">result</span><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">// Output:</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">// 36</span></span>
<span class="line"><span style="color:#999999;">}</span></span></code></pre></div><h3 id="Watcher" tabindex="-1"><span id="Watcher">Watcher</span> <a class="header-anchor" href="#Watcher" aria-label="Permalink to &quot;&lt;span id=&quot;Watcher&quot;&gt;Watcher&lt;/span&gt;&quot;">​</a></h3><p>Watcher is used for record code excution time. can start/stop/reset the watch timer. get the elapsed time of function execution.</p><p><b>Signature:</b></p><div class="language-go vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">go</span><pre class="shiki dracula-soft vp-code-dark"><code><span class="line"><span style="color:#F286C4;">type</span><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;font-style:italic;">Watcher</span><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">struct</span><span style="color:#F6F6F4;"> {</span></span>
<span class="line"><span style="color:#F6F6F4;"> startTime </span><span style="color:#97E1F1;font-style:italic;">int64</span></span>
<span class="line"><span style="color:#F6F6F4;"> stopTime </span><span style="color:#97E1F1;font-style:italic;">int64</span></span>
<span class="line"><span style="color:#F6F6F4;"> excuting </span><span style="color:#97E1F1;font-style:italic;">bool</span></span>
<span class="line"><span style="color:#F6F6F4;">}</span></span>
<span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> </span><span style="color:#62E884;">NewWatcher</span><span style="color:#F6F6F4;">() </span><span style="color:#F286C4;">*</span><span style="color:#F6F6F4;">Watcher</span></span>
<span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> (w </span><span style="color:#F286C4;">*</span><span style="color:#F6F6F4;">Watcher) </span><span style="color:#62E884;">Start</span><span style="color:#F6F6F4;">() </span><span style="color:#7B7F8B;">//start the watcher</span></span>
<span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> (w </span><span style="color:#F286C4;">*</span><span style="color:#F6F6F4;">Watcher) </span><span style="color:#62E884;">Stop</span><span style="color:#F6F6F4;">() </span><span style="color:#7B7F8B;">//stop the watcher</span></span>
<span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> (w </span><span style="color:#F286C4;">*</span><span style="color:#F6F6F4;">Watcher) </span><span style="color:#62E884;">Reset</span><span style="color:#F6F6F4;">() </span><span style="color:#7B7F8B;">//reset the watcher</span></span>
<span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> (w </span><span style="color:#F286C4;">*</span><span style="color:#F6F6F4;">Watcher) </span><span style="color:#62E884;">GetElapsedTime</span><span style="color:#F6F6F4;">() time.Duration </span><span style="color:#7B7F8B;">//get the elapsed time of function execution</span></span></code></pre><pre class="shiki vitesse-light vp-code-light"><code><span class="line"><span style="color:#1E754F;">type</span><span style="color:#393A34;"> </span><span style="color:#2E8F82;">Watcher</span><span style="color:#393A34;"> </span><span style="color:#1E754F;">struct</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> startTime </span><span style="color:#AB5959;">int64</span></span>
<span class="line"><span style="color:#393A34;"> stopTime </span><span style="color:#AB5959;">int64</span></span>
<span class="line"><span style="color:#393A34;"> excuting </span><span style="color:#AB5959;">bool</span></span>
<span class="line"><span style="color:#999999;">}</span></span>
<span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#59873A;">NewWatcher</span><span style="color:#999999;">()</span><span style="color:#393A34;"> </span><span style="color:#AB5959;">*</span><span style="color:#393A34;">Watcher</span></span>
<span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#999999;">(</span><span style="color:#393A34;">w </span><span style="color:#AB5959;">*</span><span style="color:#393A34;">Watcher</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#59873A;">Start</span><span style="color:#999999;">()</span><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">//start the watcher</span></span>
<span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#999999;">(</span><span style="color:#393A34;">w </span><span style="color:#AB5959;">*</span><span style="color:#393A34;">Watcher</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#59873A;">Stop</span><span style="color:#999999;">()</span><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">//stop the watcher</span></span>
<span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#999999;">(</span><span style="color:#393A34;">w </span><span style="color:#AB5959;">*</span><span style="color:#393A34;">Watcher</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#59873A;">Reset</span><span style="color:#999999;">()</span><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">//reset the watcher</span></span>
<span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#999999;">(</span><span style="color:#393A34;">w </span><span style="color:#AB5959;">*</span><span style="color:#393A34;">Watcher</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#59873A;">GetElapsedTime</span><span style="color:#999999;">()</span><span style="color:#393A34;"> time</span><span style="color:#999999;">.</span><span style="color:#393A34;">Duration </span><span style="color:#A0ADA0;">//get the elapsed time of function execution</span></span></code></pre></div><p><b>Example:<span style="float:right;display:inline-block;"><a href="https://go.dev/play/p/l2yrOpCLd1I" target="_blank" rel="noreferrer">Run</a></span></b></p><div class="language-go vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">go</span><pre class="shiki dracula-soft vp-code-dark"><code><span class="line"><span style="color:#F286C4;">package</span><span style="color:#F6F6F4;"> main</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F286C4;">import</span><span style="color:#F6F6F4;"> (</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">fmt</span><span style="color:#DEE492;">&quot;</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#DEE492;">&quot;</span><span style="color:#E7EE98;">github.com/duke-git/lancet/v2/function</span><span style="color:#DEE492;">&quot;</span></span>
<span class="line"><span style="color:#F6F6F4;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> </span><span style="color:#62E884;">main</span><span style="color:#F6F6F4;">() {</span></span>
<span class="line"><span style="color:#F6F6F4;"> w </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> function.</span><span style="color:#97E1F1;">NewWatcher</span><span style="color:#F6F6F4;">()</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> w.</span><span style="color:#97E1F1;">Start</span><span style="color:#F6F6F4;">()</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;">longRunningTask</span><span style="color:#F6F6F4;">()</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> fmt.</span><span style="color:#97E1F1;">Println</span><span style="color:#F6F6F4;">(w.excuting) </span><span style="color:#7B7F8B;">//true</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> w.</span><span style="color:#97E1F1;">Stop</span><span style="color:#F6F6F4;">()</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> eapsedTime </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> w.</span><span style="color:#97E1F1;">GetElapsedTime</span><span style="color:#F6F6F4;">().</span><span style="color:#97E1F1;">Milliseconds</span><span style="color:#F6F6F4;">()</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> fmt.</span><span style="color:#97E1F1;">Println</span><span style="color:#F6F6F4;">(eapsedTime)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F6F6F4;"> w.</span><span style="color:#97E1F1;">Reset</span><span style="color:#F6F6F4;">()</span></span>
<span class="line"><span style="color:#F6F6F4;">}</span></span>
<span class="line"></span>
<span class="line"><span style="color:#F286C4;">func</span><span style="color:#F6F6F4;"> </span><span style="color:#62E884;">longRunningTask</span><span style="color:#F6F6F4;">() {</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">var</span><span style="color:#F6F6F4;"> slice []</span><span style="color:#97E1F1;font-style:italic;">int64</span></span>
<span class="line"><span style="color:#F6F6F4;"> </span><span style="color:#F286C4;">for</span><span style="color:#F6F6F4;"> i </span><span style="color:#F286C4;">:=</span><span style="color:#F6F6F4;"> </span><span style="color:#BF9EEE;">0</span><span style="color:#F6F6F4;">; i </span><span style="color:#F286C4;">&lt;</span><span style="color:#F6F6F4;"> </span><span style="color:#BF9EEE;">10000000</span><span style="color:#F6F6F4;">; i</span><span style="color:#F286C4;">++</span><span style="color:#F6F6F4;"> {</span></span>
<span class="line"><span style="color:#F6F6F4;"> slice </span><span style="color:#F286C4;">=</span><span style="color:#F6F6F4;"> </span><span style="color:#97E1F1;">append</span><span style="color:#F6F6F4;">(slice, </span><span style="color:#97E1F1;">int64</span><span style="color:#F6F6F4;">(i))</span></span>
<span class="line"><span style="color:#F6F6F4;"> }</span></span>
<span class="line"><span style="color:#F6F6F4;">}</span></span></code></pre><pre class="shiki vitesse-light vp-code-light"><code><span class="line"><span style="color:#1E754F;">package</span><span style="color:#393A34;"> </span><span style="color:#59873A;">main</span></span>
<span class="line"></span>
<span class="line"><span style="color:#1E754F;">import</span><span style="color:#393A34;"> </span><span style="color:#999999;">(</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B5695999;">&quot;</span><span style="color:#59873A;">fmt</span><span style="color:#B5695999;">&quot;</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B5695999;">&quot;</span><span style="color:#59873A;">github.com/duke-git/lancet/v2/function</span><span style="color:#B5695999;">&quot;</span></span>
<span class="line"><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#59873A;">main</span><span style="color:#999999;">()</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">w</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> function</span><span style="color:#999999;">.</span><span style="color:#998418;">NewWatcher</span><span style="color:#999999;">()</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> w</span><span style="color:#999999;">.</span><span style="color:#998418;">Start</span><span style="color:#999999;">()</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#998418;">longRunningTask</span><span style="color:#999999;">()</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> fmt</span><span style="color:#999999;">.</span><span style="color:#998418;">Println</span><span style="color:#999999;">(</span><span style="color:#393A34;">w</span><span style="color:#999999;">.</span><span style="color:#393A34;">excuting</span><span style="color:#999999;">)</span><span style="color:#393A34;"> </span><span style="color:#A0ADA0;">//true</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> w</span><span style="color:#999999;">.</span><span style="color:#998418;">Stop</span><span style="color:#999999;">()</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">eapsedTime</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> w</span><span style="color:#999999;">.</span><span style="color:#998418;">GetElapsedTime</span><span style="color:#999999;">().</span><span style="color:#998418;">Milliseconds</span><span style="color:#999999;">()</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> fmt</span><span style="color:#999999;">.</span><span style="color:#998418;">Println</span><span style="color:#999999;">(</span><span style="color:#393A34;">eapsedTime</span><span style="color:#999999;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#393A34;"> w</span><span style="color:#999999;">.</span><span style="color:#998418;">Reset</span><span style="color:#999999;">()</span></span>
<span class="line"><span style="color:#999999;">}</span></span>
<span class="line"></span>
<span class="line"><span style="color:#1E754F;">func</span><span style="color:#393A34;"> </span><span style="color:#59873A;">longRunningTask</span><span style="color:#999999;">()</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#1E754F;">var</span><span style="color:#393A34;"> </span><span style="color:#B07D48;">slice</span><span style="color:#393A34;"> </span><span style="color:#999999;">[]</span><span style="color:#AB5959;">int64</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#1E754F;">for</span><span style="color:#393A34;"> </span><span style="color:#B07D48;">i</span><span style="color:#393A34;"> </span><span style="color:#999999;">:=</span><span style="color:#393A34;"> </span><span style="color:#2F798A;">0</span><span style="color:#999999;">;</span><span style="color:#393A34;"> i </span><span style="color:#AB5959;">&lt;</span><span style="color:#393A34;"> </span><span style="color:#2F798A;">10000000</span><span style="color:#999999;">;</span><span style="color:#393A34;"> i</span><span style="color:#AB5959;">++</span><span style="color:#393A34;"> </span><span style="color:#999999;">{</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#B07D48;">slice</span><span style="color:#393A34;"> </span><span style="color:#999999;">=</span><span style="color:#393A34;"> </span><span style="color:#998418;">append</span><span style="color:#999999;">(</span><span style="color:#393A34;">slice</span><span style="color:#999999;">,</span><span style="color:#393A34;"> </span><span style="color:#998418;">int64</span><span style="color:#999999;">(</span><span style="color:#393A34;">i</span><span style="color:#999999;">))</span></span>
<span class="line"><span style="color:#393A34;"> </span><span style="color:#999999;">}</span></span>
<span class="line"><span style="color:#999999;">}</span></span></code></pre></div></div></div></main><footer class="VPDocFooter" data-v-a3c25e27 data-v-5774f702><!--[--><!--]--><div class="edit-info" data-v-5774f702><div class="edit-link" data-v-5774f702><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/duke-git/lancet/edit/v2/docs/en/api/packages/function.md" target="_blank" rel="noreferrer" data-v-5774f702><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-5774f702><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Suggest changes to this page<!--]--></a></div><!----></div><nav class="prev-next" data-v-5774f702><div class="pager" data-v-5774f702><a class="pager-link prev" href="/en/api/packages/formatter.html" data-v-5774f702><span class="desc" data-v-5774f702>Previous page</span><span class="title" data-v-5774f702>formatter</span></a></div><div class="pager" data-v-5774f702><a class="pager-link next" href="/en/api/packages/mathutil.html" data-v-5774f702><span class="desc" data-v-5774f702>Next page</span><span class="title" data-v-5774f702>mathutil</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-324e8308 data-v-e4279f1c><div class="container" data-v-e4279f1c><p class="message" data-v-e4279f1c>Released under the MIT License.</p><p class="copyright" data-v-e4279f1c>Copyright © 2023-present Duke Du</p></div></footer><!--[--><!--]--></div></div>
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