test&doc: add example and update doc for function package

docs/function.md

@@ -22,7 +22,7 @@ import (
 ## Index
 - [After](#After)
 - [Before](#Before)
-- [Curry](#Curry)
+- [CurryFn](#CurryFn)
 - [Compose](#Compose)
 - [Debounced](#Debounced)
 - [Delay](#Delay)
@@ -125,15 +125,15 @@ func main() {
 
 
 
-### <span id="Curry">Curry</span>
+### <span id="CurryFn">CurryFn</span>
 
-<p>Make a curry function.</p>
+<p>Make curry function.</p>
 
 <b>Signature:</b>
 
 ```go
-type Fn func(...any) any
-func (f Fn) Curry(i any) func(...any) any
+type CurryFn[T any] func(...T) T
+func (cf CurryFn[T]) New(val T) func(...T) T
 ```
 <b>Example:</b>
 
@@ -149,12 +149,15 @@ func main() {
     add := func(a, b int) int {
 		return a + b
 	}
-	var addCurry function.Fn = func(values ...any) any {
-		return add(values[0].(int), values[1].(int))
+
+	var addCurry CurryFn[int] = func(values ...int) int {
+		return add(values[0], values[1])
 	}
-	add1 := addCurry.Curry(1)
+	add1 := addCurry.New(1)
+
 	result := add1(2)
-    fmt.Println(result) //3
+
+	fmt.Println(result) //3
 }
 ```
 
@@ -167,7 +170,7 @@ func main() {
 <b>Signature:</b>
 
 ```go
-func Compose(fnList ...func(...any) any) func(...any) any
+func Compose[T any](fnList ...func(...T) T) func(...T) T
 ```
 <b>Example:</b>
 
@@ -180,17 +183,17 @@ import (
 )
 
 func main() {
-    add1 := func(v ...any) any {
-		return v[0].(int) + 1
+   	toUpper := func(strs ...string) string {
+		return strings.ToUpper(strs[0])
 	}
-    add2 := func(v ...any) any {
-		return v[0].(int) + 2
+	toLower := func(strs ...string) string {
+		return strings.ToLower(strs[0])
 	}
+	transform := Compose(toUpper, toLower)
 
-    add3 := function.Compose(add1, add2)
-	result := add3(1)
+	result := transform("aBCde")
 
-    fmt.Println(result) //4
+	fmt.Println(result) //ABCDE
 }
 ```
 
@@ -259,9 +262,9 @@ import (
 
 func main() {
 	var print = func(s string) {
-		fmt.Println(count) //test delay
+		fmt.Println(count) //delay 2 seconds
 	}
-	function.Delay(2*time.Second, print, "test delay")
+	function.Delay(2*time.Second, print, "delay 2 seconds")
 }
 ```
 
@@ -332,9 +335,9 @@ func main() {
 		return x * x
 	}
 
-	f := Pipeline(addOne, double, square)
+	fn := Pipeline(addOne, double, square)
 
-	fmt.Println(f(2)) //36
+	fmt.Println(fn(2)) //36
 }
 ```
 
@@ -351,6 +354,7 @@ type Watcher struct {
 	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
@@ -367,7 +371,8 @@ import (
 )
 
 func main() {
-    w := &function.Watcher{}
+   	w := function.NewWatcher()
+
 	w.Start()
 
 	longRunningTask()
@@ -377,14 +382,10 @@ func main() {
 	w.Stop()
 
 	eapsedTime := w.GetElapsedTime().Milliseconds()
+	
 	fmt.Println(eapsedTime)
 
 	w.Reset()
-
-	fmt.Println(w.excuting) //false
-
-	fmt.Println(w.startTime) //0
-	fmt.Println(w.stopTime) //0
 }
 
 func longRunningTask() {