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---
outline: deep
---
# API概述
<b>lancet（柳叶刀）是一个强大、全面、高效、可复用的go语言工具函数库。包含25个包，超过600个工具函数。功能涵盖字符串处理、切片处理、网络、并发、加解密、文件处理、时间/日期、流处理、迭代器等等。</b>
<style>
.package-title {
color: black;
font-size: 18px;
text-align: center;
font-weight: bold;
}
.package-container {
font-size: 16px;
border: 1px dashed;
padding: 10px;
text-align: center;
}
.package-cell {
height: 40px;
width: 140px;
display: inline-block;
vertical-align: middle;
line-height: 40px;
background: #ecefff;
border: 1px solid;
margin-right: 10px;
margin-bottom: 10px;
border-radius: 6px;
font-weight: bold;
}
</style>
<div>
<p class="package-title">lancet功能模块</p>
<div class="package-container">
<div class="package-cell">algorithm</div>
<div class="package-cell">compare</div>
<div class="package-cell">concurrency</div>
<div class="package-cell">condition</div>
<div class="package-cell">convertor</div>
<div class="package-cell">cryptor</div>
<div class="package-cell">datastructure</div>
<div class="package-cell">datetime</div>
<div class="package-cell">fileutil</div>
<div class="package-cell">formatter</div>
<div class="package-cell">function</div>
<div class="package-cell">iterator</div>
<div class="package-cell">maputil</div>
<div class="package-cell">mathutil</div>
<div class="package-cell">netutil</div>
<div class="package-cell">pointer</div>
<div class="package-cell">random</div>
<div class="package-cell">retry</div>
<div class="package-cell">slice</div>
<div class="package-cell">stream</div>
<div class="package-cell">structs</div>
<div class="package-cell">strutil</div>
<div class="package-cell">system</div>
<div class="package-cell">tuple</div>
<div class="package-cell">validator</div>
<div class="package-cell">xerror</div>
</div>
</div>

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# Algorithm
algorithm 算法包实现一些基本算法，sort，search，lrucache。
<div STYLE="page-break-after: always;"></div>
## 源码
- [https://github.com/duke-git/lancet/blob/main/algorithm/sort.go](https://github.com/duke-git/lancet/blob/main/algorithm/sort.go)
- [https://github.com/duke-git/lancet/blob/main/algorithm/search.go](https://github.com/duke-git/lancet/blob/main/algorithm/search.go)
- [https://github.com/duke-git/lancet/blob/main/algorithm/lru_cache.go](https://github.com/duke-git/lancet/blob/main/algorithm/lru_cache.go)
<div STYLE="page-break-after: always;"></div>
## 用法
```go
import (
"github.com/duke-git/lancet/v2/algorithm"
)
```
<div STYLE="page-break-after: always;"></div>
## 目录
- [BubbleSort](#BubbleSort)
- [InsertionSort](#InsertionSort)
- [SelectionSort](#SelectionSort)
- [ShellSort](#ShellSort)
- [QuickSort](#QuickSort)
- [HeapSort](#HeapSort)
- [MergeSort](#MergeSort)
- [CountSort](#CountSort)
- [BinarySearch](#BinarySearch)
- [BinaryIterativeSearch](#BinaryIterativeSearch)
- [LinearSearch](#LinearSearch)
- [LRUCache](#LRUCache)
<div STYLE="page-break-after: always;"></div>
## 文档
### <span id="BubbleSort">BubbleSort</span>
<p>冒泡排序，参数comparator需要实现包lancetconstraints.Comparator。</p>
<b>函数签名:</b>
```go
func BubbleSort[T any](slice []T, comparator lancetconstraints.Comparator)
```
<b>示例:<span style="display:inline-block;float:right;">[运行](https://go.dev/play/p/GNdv7Jg2Taj)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/algorithm"
)
type intComparator struct{}
func (c *intComparator) Compare(v1 any, v2 any) int {
val1, _ := v1.(int)
val2, _ := v2.(int)
//ascending order
if val1 < val2 {
return -1
} else if val1 > val2 {
return 1
}
return 0
}
func main() {
numbers := []int{2, 1, 5, 3, 6, 4}
comparator := &intComparator{}
algorithm.BubbleSort(numbers, comparator)
fmt.Println(numbers)
// Output:
// [1 2 3 4 5 6]
}
```
### <span id="InsertionSort">InsertionSort</span>
<p>插入排序，参数comparator需要实现包lancetconstraints.Comparator。</p>
<b>函数签名:</b>
```go
func InsertionSort[T any](slice []T, comparator lancetconstraints.Comparator)
```
<b>示例:<span style="display:inline-block;float:right;">[运行](https://go.dev/play/p/G5LJiWgJJW6)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/algorithm"
)
type people struct {
Name string
Age int
}
// PeopleAageComparator sort people slice by age field
type peopleAgeComparator struct{}
// Compare implements github.com/duke-git/lancet/lancetconstraints/constraints.go/Comparator
func (pc *peopleAgeComparator) Compare(v1 any, v2 any) int {
p1, _ := v1.(people)
p2, _ := v2.(people)
//ascending order
if p1.Age < p2.Age {
return -1
} else if p1.Age > p2.Age {
return 1
}
return 0
}
func main() {
peoples := []people{
{Name: "a", Age: 20},
{Name: "b", Age: 10},
{Name: "c", Age: 17},
{Name: "d", Age: 8},
{Name: "e", Age: 28},
}
comparator := &peopleAgeComparator{}
algorithm.InsertionSort(peoples, comparator)
fmt.Println(peoples)
// Output:
// [{d 8} {b 10} {c 17} {a 20} {e 28}]
}
```
### <span id="SelectionSort">SelectionSort</span>
<p>选择排序，参数comparator需要实现包lancetconstraints.Comparator。</p>
<b>函数签名:</b>
```go
func SelectionSort[T any](slice []T, comparator lancetconstraints.Comparator)
```
<b>示例:<span style="display:inline-block;float:right;">[运行](https://go.dev/play/p/oXovbkekayS)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/algorithm"
)
type intComparator struct{}
func (c *intComparator) Compare(v1 any, v2 any) int {
val1, _ := v1.(int)
val2, _ := v2.(int)
//ascending order
if val1 < val2 {
return -1
} else if val1 > val2 {
return 1
}
return 0
}
func main() {
numbers := []int{2, 1, 5, 3, 6, 4}
comparator := &intComparator{}
algorithm.SelectionSort(numbers, comparator)
fmt.Println(numbers)
// Output:
// [1 2 3 4 5 6]
}
```
### <span id="ShellSort">ShellSort</span>
<p>希尔排序，参数comparator需要实现包lancetconstraints.Comparator。</p>
<b>函数签名:</b>
```go
func ShellSort[T any](slice []T, comparator lancetconstraints.Comparator)
```
<b>示例:<span style="display:inline-block;float:right;">[运行](https://go.dev/play/p/3ibkszpJEu3)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/algorithm"
)
type intComparator struct{}
func (c *intComparator) Compare(v1 any, v2 any) int {
val1, _ := v1.(int)
val2, _ := v2.(int)
//ascending order
if val1 < val2 {
return -1
} else if val1 > val2 {
return 1
}
return 0
}
func main() {
numbers := []int{2, 1, 5, 3, 6, 4}
comparator := &intComparator{}
algorithm.ShellSort(numbers, comparator)
fmt.Println(numbers)
// Output:
// [1 2 3 4 5 6]
}
```
### <span id="QuickSort">QuickSort</span>
<p>快速排序，参数comparator需要实现包lancetconstraints.Comparator。</p>
<b>函数签名:</b>
```go
func QuickSort[T any](slice []T comparator lancetconstraints.Comparator)
```
<b>示例:<span style="display:inline-block;float:right;">[运行](https://go.dev/play/p/7Y7c1Elk3ax)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/algorithm"
)
type intComparator struct{}
func (c *intComparator) Compare(v1 any, v2 any) int {
val1, _ := v1.(int)
val2, _ := v2.(int)
//ascending order
if val1 < val2 {
return -1
} else if val1 > val2 {
return 1
}
return 0
}
func main() {
numbers := []int{2, 1, 5, 3, 6, 4}
comparator := &intComparator{}
algorithm.QuickSort(numbers, comparator)
fmt.Println(numbers)
// Output:
// [1 2 3 4 5 6]
}
```
### <span id="HeapSort">HeapSort</span>
<p>堆排序，参数comparator需要实现包lancetconstraints.Comparator。</p>
<b>函数签名:</b>
```go
func HeapSort[T any](slice []T, comparator lancetconstraints.Comparator)
```
<b>示例:<span style="display:inline-block;float:right;">[运行](https://go.dev/play/p/u6Iwa1VZS_f)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/algorithm"
)
type intComparator struct{}
func (c *intComparator) Compare(v1 any, v2 any) int {
val1, _ := v1.(int)
val2, _ := v2.(int)
//ascending order
if val1 < val2 {
return -1
} else if val1 > val2 {
return 1
}
return 0
}
func main() {
numbers := []int{2, 1, 5, 3, 6, 4}
comparator := &intComparator{}
algorithm.HeapSort(numbers, comparator)
fmt.Println(numbers)
// Output:
// [1 2 3 4 5 6]
}
```
### <span id="MergeSort">MergeSort</span>
<p>归并排序，参数comparator需要实现包lancetconstraints.Comparator。</p>
<b>函数签名:</b>
```go
func MergeSort[T any](slice []T, comparator lancetconstraints.Comparator)
```
<b>示例:<span style="display:inline-block;float:right;">[运行](https://go.dev/play/p/ydinn9YzUJn)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/algorithm"
)
type intComparator struct{}
func (c *intComparator) Compare(v1 any, v2 any) int {
val1, _ := v1.(int)
val2, _ := v2.(int)
//ascending order
if val1 < val2 {
return -1
} else if val1 > val2 {
return 1
}
return 0
}
func main() {
numbers := []int{2, 1, 5, 3, 6, 4}
comparator := &intComparator{}
algorithm.MergeSort(numbers, comparator)
fmt.Println(numbers)
// Output:
// [1 2 3 4 5 6]
}
```
### <span id="CountSort">CountSort</span>
<p>计数排序，参数comparator需要实现包lancetconstraints.Comparator。</p>
<b>函数签名:</b>
```go
func CountSort[T any](slice []T, comparator lancetconstraints.Comparator) []T
```
<b>示例:<span style="display:inline-block;float:right;">[运行](https://go.dev/play/p/tB-Umgm0DrP)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/algorithm"
)
type intComparator struct{}
func (c *intComparator) Compare(v1 any, v2 any) int {
val1, _ := v1.(int)
val2, _ := v2.(int)
//ascending order
if val1 < val2 {
return -1
} else if val1 > val2 {
return 1
}
return 0
}
func main() {
numbers := []int{2, 1, 5, 3, 6, 4}
comparator := &intComparator{}
sortedNums := algorithm.CountSort(numbers, comparator)
fmt.Println(sortedNums)
// Output:
// [1 2 3 4 5 6]
}
```
### <span id="BinarySearch">BinarySearch</span>
<p>二分递归查找，返回元素索引，未找到元素返回-1，参数comparator需要实现包lancetconstraints.Comparator。</p>
<b>函数签名:</b>
```go
func BinarySearch[T any](sortedSlice []T, target T, lowIndex, highIndex int, comparator lancetconstraints.Comparator) int
```
<b>示例: <span style="display:inline-block;float:right;">[运行](https://go.dev/play/p/t6MeGiUSN47)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/algorithm"
)
type intComparator struct{}
func (c *intComparator) Compare(v1 any, v2 any) int {
val1, _ := v1.(int)
val2, _ := v2.(int)
//ascending order
if val1 < val2 {
return -1
} else if val1 > val2 {
return 1
}
return 0
}
func main() {
numbers := []int{1, 2, 3, 4, 5, 6, 7, 8}
comparator := &intComparator{}
result1 := algorithm.BinarySearch(numbers, 5, 0, len(numbers)-1, comparator)
result2 := algorithm.BinarySearch(numbers, 9, 0, len(numbers)-1, comparator)
fmt.Println(result1)
fmt.Println(result2)
// Output:
// 4
// -1
}
```
### <span id="BinaryIterativeSearch">BinaryIterativeSearch</span>
<p>二分迭代查找，返回元素索引，未找到元素返回-1，参数comparator需要实现包lancetconstraints.Comparator。</p>
<b>函数签名:</b>
```go
func BinaryIterativeSearch[T any](sortedSlice []T, target T, lowIndex, highIndex int, comparator lancetconstraints.Comparator) int
```
<b>示例: <span style="display:inline-block;float:right;">[运行](https://go.dev/play/p/Anozfr8ZLH3)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/algorithm"
)
type intComparator struct{}
func (c *intComparator) Compare(v1 any, v2 any) int {
val1, _ := v1.(int)
val2, _ := v2.(int)
//ascending order
if val1 < val2 {
return -1
} else if val1 > val2 {
return 1
}
return 0
}
func main() {
numbers := []int{1, 2, 3, 4, 5, 6, 7, 8}
comparator := &intComparator{}
result1 := algorithm.BinaryIterativeSearch(numbers, 5, 0, len(numbers)-1, comparator)
result2 := algorithm.BinaryIterativeSearch(numbers, 9, 0, len(numbers)-1, comparator)
fmt.Println(result1)
fmt.Println(result2)
// Output:
// 4
// -1
}
```
### <span id="LinearSearch">LinearSearch</span>
<p>基于传入的相等函数线性查找元素，返回元素索引，未找到元素返回-1。</p>
<b>函数签名:</b>
```go
func LinearSearch[T any](slice []T, target T, equal func(a, b T) bool) int
```
<b>示例: <span style="display:inline-block;float:right;">[运行](https://go.dev/play/p/IsS7rgn5s3x)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/algorithm"
)
func main() {
numbers := []int{3, 4, 5, 3, 2, 1}
equalFunc := func(a, b int) bool {
return a == b
}
result1 := algorithm.LinearSearch(numbers, 3, equalFunc)
result2 := algorithm.LinearSearch(numbers, 6, equalFunc)
fmt.Println(result1)
fmt.Println(result2)
// Output:
// 0
// -1
}
```
### <span id="LRUCache">LRUCache</span>
<p>lru算法实现缓存。</p>
<b>函数签名:</b>
```go
func NewLRUCache[K comparable, V any](capacity int) *LRUCache[K, V]
func (l *LRUCache[K, V]) Get(key K) (V, bool)
func (l *LRUCache[K, V]) Put(key K, value V)
func (l *LRUCache[K, V]) Delete(key K) bool
func (l *LRUCache[K, V]) Len() int
```
<b>示例:<span style="display:inline-block;float:right;">[运行](https://go.dev/play/p/-EZjgOURufP)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/algorithm"
)
func main() {
cache := algorithm.NewLRUCache[int, int](2)
cache.Put(1, 1)
cache.Put(2, 2)
result1, ok1 := cache.Get(1)
result2, ok2 := cache.Get(2)
result3, ok3 := cache.Get(3)
fmt.Println(result1, ok1)
fmt.Println(result2, ok2)
fmt.Println(result3, ok3)
fmt.Println(cache.Len())
ok := cache.Delete(2)
fmt.Println(ok)
// Output:
// 1 true
// 2 true
// 0 false
// 2
// true
}
```

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# Compare
compare包提供几个轻量级的类型比较函数。
<div STYLE="page-break-after: always;"></div>
## 源码:
- [https://github.com/duke-git/lancet/blob/main/compare/compare.go](https://github.com/duke-git/lancet/blob/main/compare/compare.go)
- [https://github.com/duke-git/lancet/blob/main/compare/compare_internal.go](https://github.com/duke-git/lancet/blob/main/compare/compare_internal.go)
<div STYLE="page-break-after: always;"></div>
## 用法:
```go
import (
"github.com/duke-git/lancet/v2/condition"
)
```
<div STYLE="page-break-after: always;"></div>
## 目录
- [Equal](#Equal)
- [EqualValue](#EqualValue)
- [LessThan](#LessThan)
- [GreaterThan](#GreaterThan)
- [LessOrEqual](#LessOrEqual)
- [GreaterOrEqual](#GreaterOrEqual)
- [InDelta](#InDelta)
<div STYLE="page-break-after: always;"></div>
## 文档
### <span id="Equal">Equal</span>
<p>检查两个值是否相等(检查类型和值)</p>
<b>函数签名:</b>
```go
func Equal(left, right any) bool
```
<b>示例: <span style="display:inline-block;float:right;">[运行](https://go.dev/play/p/wmVxR-to4lz)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/compare"
)
func main() {
result1 := compare.Equal(1, 1)
result2 := compare.Equal("1", "1")
result3 := compare.Equal([]int{1, 2, 3}, []int{1, 2, 3})
result4 := compare.Equal(map[int]string{1: "a", 2: "b"}, map[int]string{1: "a", 2: "b"})
result5 := compare.Equal(1, "1")
result6 := compare.Equal(1, int64(1))
result7 := compare.Equal([]int{1, 2}, []int{1, 2, 3})
fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
fmt.Println(result5)
fmt.Println(result6)
fmt.Println(result7)
// Output:
// true
// true
// true
// true
// false
// false
// false
}
```
### <span id="EqualValue">EqualValue</span>
<p>检查两个值是否相等(只检查值)</p>
<b>函数签名:</b>
```go
func EqualValue(left, right any) bool
```
<b>示例: <span style="display:inline-block;float:right;">[运行](https://go.dev/play/p/fxnna_LLD9u)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/compare"
)
func main() {
result1 := compare.EqualValue(1, 1)
result2 := compare.EqualValue(int(1), int64(1))
result3 := compare.EqualValue(1, "1")
result4 := compare.EqualValue(1, "2")
fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
// Output:
// true
// true
// true
// false
}
```
### <span id="LessThan">LessThan</span>
<p>验证参数`left`的值是否小于参数`right`的值。</p>
<b>函数签名:</b>
```go
func LessThan(left, right any) bool
```
<b>示例: <span style="display:inline-block;float:right;">[运行](https://go.dev/play/p/cYh7FQQj0ne)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/compare"
)
func main() {
result1 := compare.LessThan(1, 2)
result2 := compare.LessThan(1.1, 2.2)
result3 := compare.LessThan("a", "b")
time1 := time.Now()
time2 := time1.Add(time.Second)
result4 := compare.LessThan(time1, time2)
result5 := compare.LessThan(2, 1)
result6 := compare.LessThan(1, int64(2))
fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
fmt.Println(result5)
fmt.Println(result6)
// Output:
// true
// true
// true
// true
// false
// false
}
```
### <span id="GreaterThan">GreaterThan</span>
<p>验证参数`left`的值是否大于参数`right`的值。</p>
<b>函数签名:</b>
```go
func GreaterThan(left, right any) bool
```
<b>示例: <span style="display:inline-block;float:right;">[运行](https://go.dev/play/p/9-NYDFZmIMp)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/compare"
)
func main() {
result1 := compare.GreaterThan(2, 1)
result2 := compare.GreaterThan(2.2, 1.1)
result3 := compare.GreaterThan("b", "a")
time1 := time.Now()
time2 := time1.Add(time.Second)
result4 := compare.GreaterThan(time2, time1)
result5 := compare.GreaterThan(1, 2)
result6 := compare.GreaterThan(int64(2), 1)
result7 := compare.GreaterThan("b", "c")
fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
fmt.Println(result5)
fmt.Println(result6)
fmt.Println(result7)
// Output:
// true
// true
// true
// true
// false
// false
// false
}
```
### <span id="LessOrEqual">LessOrEqual</span>
<p>验证参数`left`的值是否小于或等于参数`right`的值。</p>
<b>函数签名:</b>
```go
func LessOrEqual(left, right any) bool
```
<b>示例: <span style="display:inline-block;float:right;">[运行](https://go.dev/play/p/e4T_scwoQzp)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/compare"
)
func main() {
result1 := compare.LessOrEqual(1, 1)
result2 := compare.LessOrEqual(1.1, 2.2)
result3 := compare.LessOrEqual("a", "b")
time1 := time.Now()
time2 := time1.Add(time.Second)
result4 := compare.LessOrEqual(time1, time2)
result5 := compare.LessOrEqual(2, 1)
result6 := compare.LessOrEqual(1, int64(2))
fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
fmt.Println(result5)
fmt.Println(result6)
// Output:
// true
// true
// true
// true
// false
// false
}
```
### <span id="GreaterOrEqual">GreaterOrEqual</span>
<p>验证参数`left`的值是否大于或参数`right`的值。</p>
<b>函数签名:</b>
```go
func GreaterOrEqual(left, right any) bool
```
<b>示例: <span style="display:inline-block;float:right;">[运行](https://go.dev/play/p/vx8mP0U8DFk)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/compare"
)
func main() {
result1 := compare.GreaterOrEqual(1, 1)
result2 := compare.GreaterOrEqual(2.2, 1.1)
result3 := compare.GreaterOrEqual("b", "b")
time1 := time.Now()
time2 := time1.Add(time.Second)
result4 := compare.GreaterOrEqual(time2, time1)
result5 := compare.GreaterOrEqual(1, 2)
result6 := compare.GreaterOrEqual(int64(2), 1)
result7 := compare.GreaterOrEqual("b", "c")
fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
fmt.Println(result5)
fmt.Println(result6)
fmt.Println(result7)
// Output:
// true
// true
// true
// true
// false
// false
// false
}
```
### <span id="InDelta">InDelta</span>
<p>检查增量内两个值是否相等。</p>
<b>函数签名:</b>
```go
func InDelta[T constraints.Integer | constraints.Float](left, right T, delta float64) bool
```
<b>示例: <span style="display:inline-block;float:right;">[运行](https://go.dev/play/p/TuDdcNtMkjo)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/compare"
)
func main() {
result1 := InDelta(1, 1, 0)
result2 := InDelta(1, 2, 0)
result3 := InDelta(2.0/3.0, 0.66667, 0.001)
result4 := InDelta(2.0/3.0, 0.0, 0.001)
result5 := InDelta(float64(74.96)-float64(20.48), 54.48, 0)
result6 := InDelta(float64(74.96)-float64(20.48), 54.48, 1e-14)
fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
fmt.Println(result4)
fmt.Println(result5)
fmt.Println(result6)
// Output:
// true
// false
// true
// false
// false
// true
}
```