doc: add go playground demo

README.md

@@ -705,8 +705,11 @@ import "github.com/duke-git/lancet/v2/mathutil"
     [[play](https://go.dev/play/p/aumarSHIGzP)]
 -   **<big>Range</big>** : Creates a slice of numbers from start with specified count, element step is 1.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/mathutil.md#Range)]
+    [[play](https://go.dev/play/p/9ke2opxa8ZP)]
 -   **<big>RangeWithStep</big>** : Creates a slice of numbers from start to end with specified step.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/mathutil.md#Range)]
+    [[play](https://go.dev/play/p/akLWz0EqOSM)]
+
 
 ### 13. Netutil package contains functions to get net information and send http request.
 
@@ -921,7 +924,8 @@ import "github.com/duke-git/lancet/v2/slice"
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice.md#ForEach)]
     [[play](https://go.dev/play/p/DrPaa4YsHRF)]
 -   **<big>ForEachWithBreak</big>** : iterates over elements of slice and invokes function for each element, when iteratee return false, will break the for each loop.
-    [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice.md#ForEach)]
+    [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice.md#ForEachWithBreak)]
+    [[play](https://go.dev/play/p/qScs39f3D9W)]
 -   **<big>GroupBy</big>** : iterate over elements of the slice, each element will be group by criteria, returns two slices.
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice.md#GroupBy)]
     [[play](https://go.dev/play/p/QVkPxzPR0iA)]

README_zh-CN.md

@@ -704,8 +704,11 @@ import "github.com/duke-git/lancet/v2/mathutil"
     [[play](https://go.dev/play/p/aumarSHIGzP)]
 -   **<big>Range</big>** : 根据指定的起始值和数量，创建一个数字切片。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/mathutil_zh-CN.md#Range)]
+    [[play](https://go.dev/play/p/9ke2opxa8ZP)]
 -   **<big>RangeWithStep</big>** : 根据指定的起始值，结束值，步长，创建一个数字切片。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/mathutil_zh-CN.md#RangeWithStep)]
+    [[play](https://go.dev/play/p/akLWz0EqOSM)]
+
 
 ### 13. netutil网络包支持获取 ip 地址，发送 http 请求。
 
@@ -921,6 +924,7 @@ import "github.com/duke-git/lancet/v2/slice"
     [[play](https://go.dev/play/p/DrPaa4YsHRF)]
 -   **<big>ForEachWithBreak</big>** : 遍历切片的元素并为每个元素调用iteratee函数，当iteratee函数返回false时，终止遍历。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice_zh-CN.md#ForEachWithBreak)]
+    [[play](https://go.dev/play/p/qScs39f3D9W)]
 -   **<big>GroupBy</big>** : 迭代切片的元素，每个元素将按条件分组，返回两个切片。
     [[doc](https://github.com/duke-git/lancet/blob/main/docs/slice_zh-CN.md#GroupBy)]
     [[play](https://go.dev/play/p/QVkPxzPR0iA)]

mathutil/mathutil.go

@@ -185,7 +185,7 @@ func Average[T constraints.Integer | constraints.Float](numbers ...T) T {
 }
 
 // Range creates a slice of numbers from start with specified count, element step is 1.
-// Play: todo
+// Play: https://go.dev/play/p/9ke2opxa8ZP
 func Range[T constraints.Integer | constraints.Float](start T, count int) []T {
 	size := count
 	if count < 0 {
@@ -202,7 +202,7 @@ func Range[T constraints.Integer | constraints.Float](start T, count int) []T {
 }
 
 // RangeWithStep creates a slice of numbers from start to end with specified step.
-// Play: todo
+// Play: https://go.dev/play/p/akLWz0EqOSM
 func RangeWithStep[T constraints.Integer | constraints.Float](start, end, step T) []T {
 	result := []T{}
 

slice/slice.go

@@ -423,6 +423,7 @@ func ForEach[T any](slice []T, iteratee func(index int, item T)) {
 
 // ForEachWithBreak iterates over elements of slice and invokes function for each element,
 // when iteratee return false, will break the for each loop.
+// Play: https://go.dev/play/p/qScs39f3D9W
 func ForEachWithBreak[T any](slice []T, iteratee func(index int, item T) bool) {
 	for i, v := range slice {
 		if !iteratee(i, v) {