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# Function
function 函数包控制函数执行流程，包含部分函数式编程。
<div STYLE="page-break-after: always;"></div>
## 源码:
- [https://github.com/duke-git/lancet/blob/main/function/function.go](https://github.com/duke-git/lancet/blob/main/function/function.go)
- [https://github.com/duke-git/lancet/blob/main/function/watcher.go](https://github.com/duke-git/lancet/blob/main/function/watcher.go)
<div STYLE="page-break-after: always;"></div>
## 用法:
```go
import (
"github.com/duke-git/lancet/v2/function"
)
```
<div STYLE="page-break-after: always;"></div>
## 目录
- [After](#After)
- [Before](#Before)
- [CurryFn](#CurryFn)
- [Compose](#Compose)
- [Debounced](#Debounced)
- [Delay](#Delay)
- [Schedule](#Schedule)
- [Pipeline](#Pipeline)
- [Watcher](#Watcher)
<div STYLE="page-break-after: always;"></div>
## 文档
### <span id="After">After</span>
<p>创建一个函数，当他被调用n或更多次之后将马上触发fn</p>
<b>函数签名:</b>
```go
func After(n int, fn any) func(args ...any) []reflect.Value
```
<b>示例:</b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/function"
)
func main() {
fn := function.After(2, func() {
fmt.Println("hello")
})
fn()
fn()
// Output:
// hello
}
```
### <span id="Before">Before</span>
<p>创建一个函数，调用次数不超过n次，之后再调用这个函数，将返回一次最后调用fn的结果</p>
<b>函数签名:</b>
```go
func Before(n int, fn any) func(args ...any) []reflect.Value
```
<b>示例:</b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/function"
"github.com/duke-git/lancet/v2/internal"
)
func main() {
fn := function.Before(2, func() {
fmt.Println("hello")
})
fn()
fn()
fn()
fn()
// Output:
// hello
// hello
}
```
### <span id="CurryFn">CurryFn</span>
<p>创建柯里化函数</p>
<b>函数签名:</b>
```go
type CurryFn[T any] func(...T) T
func (cf CurryFn[T]) New(val T) func(...T) T
```
<b>示例:</b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/function"
)
func main() {
add := func(a, b int) int {
return a + b
}
var addCurry function.CurryFn[int] = func(values ...int) int {
return add(values[0], values[1])
}
add1 := addCurry.New(1)
result := add1(2)
fmt.Println(result)
// Output:
// 3
}
```
### <span id="Compose">Compose</span>
<p>从右至左组合函数列表fnList，返回组合后的函数</p>
<b>函数签名:</b>
```go
func Compose[T any](fnList ...func(...T) T) func(...T) T
```
<b>示例:</b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/function"
)
func main() {
toUpper := func(strs ...string) string {
return strings.ToUpper(strs[0])
}
toLower := func(strs ...string) string {
return strings.ToLower(strs[0])
}
transform := function.Compose(toUpper, toLower)
result := transform("aBCde")
fmt.Println(result)
// Output:
// ABCDE
}
```
### <span id="Debounced">Debounced</span>
<p>创建一个debounced函数，该函数延迟调用fn直到自上次调用debounced函数后等待持续时间过去。</p>
<b>函数签名:</b>
```go
func Debounced(fn func(), duration time.Duration) func()
```
<b>示例:</b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/function"
)
func main() {
count := 0
add := func() {
count++
}
debouncedAdd := function.Debounced(add, 50*time.Microsecond)
debouncedAdd()
debouncedAdd()
debouncedAdd()
debouncedAdd()
time.Sleep(100 * time.Millisecond)
fmt.Println(count)
debouncedAdd()
time.Sleep(100 * time.Millisecond)
fmt.Println(count)
// Output:
// 1
// 2
}
```
### <span id="Delay">Delay</span>
<p>延迟delay时间后调用函数</p>
<b>函数签名:</b>
```go
func Delay(delay time.Duration, fn any, args ...any)
```
<b>示例:</b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/function"
)
func main() {
var print = func(s string) {
fmt.Println(s)
}
function.Delay(2*time.Second, print, "hello")
// Output:
// hello
}
```
### <span id="Schedule">Schedule</span>
<p>每次持续时间调用函数，直到关闭返回的 bool chan</p>
<b>函数签名:</b>
```go
func Schedule(d time.Duration, fn any, args ...any) chan bool
```
<b>示例:</b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/function"
)
func main() {
count := 0
increase := func() {
count++
}
stop := function.Schedule(2*time.Second, increase)
time.Sleep(2 * time.Second)
close(stop)
fmt.Println(count)
// Output:
// 2
}
```
### <span id="Pipeline">Pipeline</span>
<p>执行函数pipeline.</p>
<b>函数签名:</b>
```go
func Pipeline[T any](funcs ...func(T) T) func(T) T
```
<b>示例:</b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/function"
)
func main() {
addOne := func(x int) int {
return x + 1
}
double := func(x int) int {
return 2 * x
}
square := func(x int) int {
return x * x
}
fn := function.Pipeline(addOne, double, square)
result := fn(2)
fmt.Println(result)
// Output:
// 36
}
```
### <span id="Watcher">Watcher</span>
<p>Watcher用于记录代码执行时间。可以启动/停止/重置手表定时器。获取函数执行的时间。</p>
<b>函数签名:</b>
```go
type Watcher struct {
startTime int64
stopTime int64
excuting bool
}
func NewWatcher() *Watcher
func (w *Watcher) Start() //start the watcher
func (w *Watcher) Stop() //stop the watcher
func (w *Watcher) Reset() //reset the watcher
func (w *Watcher) GetElapsedTime() time.Duration //get the elapsed time of function execution
```
<b>示例:</b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/function"
)
func main() {
w := function.NewWatcher()
w.Start()
longRunningTask()
fmt.Println(w.excuting) //true
w.Stop()
eapsedTime := w.GetElapsedTime().Milliseconds()
fmt.Println(eapsedTime)
w.Reset()
}
func longRunningTask() {
var slice []int64
for i := 0; i < 10000000; i++ {
slice = append(slice, int64(i))
}
}
```