List: add cap (#51)

Cap return cap of the inner data

datastructure/list/list.go

@@ -248,6 +248,11 @@ func (l *List[T]) Size() int {
 	return len(l.data)
 }
 
+// Cap return cap of the inner data
+func (l *List[T]) Cap() int {
+	return cap(l.data)
+}
+
 // Swap the value of index i and j in list
 func (l *List[T]) Swap(i, j int) {
 	size := len(l.data)

datastructure/list/list_test.go

@@ -261,6 +261,18 @@ func TestSize(t *testing.T) {
 	assert.Equal(0, empty.Size())
 }
 
+func TestCap(t *testing.T) {
+	assert := internal.NewAssert(t, "TestCap")
+
+	data := make([]int, 0, 100)
+	list := NewList(data)
+	assert.Equal(100, list.Cap())
+
+	data = make([]int, 0)
+	list = NewList(data)
+	assert.Equal(0, list.Cap())
+}
+
 func TestSwap(t *testing.T) {
 	assert := internal.NewAssert(t, "TestSwap")
 

docs/datastructure/list.md

@@ -41,6 +41,7 @@ import (
 - [Clone](#Clone)
 - [Merge](#Merge)
 - [Size](#Size)
+- [Cap](#Cap)
 - [Swap](#Swap)
 - [Reverse](#Reverse)
 - [Unique](#Unique)
@@ -651,6 +652,36 @@ func main() {
 
 
 
+### <span id="Cap">Cap</span>
+<p>Cap return cap of the inner data</p>
+
+<b>Signature:</b>
+
+```go
+func (l *List[T]) Cap() int
+```
+<b>Example:</b>
+
+```go
+package main
+
+import (
+    "fmt"
+    list "github.com/duke-git/lancet/v2/datastructure/list"
+)
+
+func main() {
+	data := make([]int, 0, 100)
+	
+    li := list.NewList(data)
+
+    fmt.Println(li.Cap()) // 100
+}
+```
+
+
+
+
 ### <span id="Swap">Swap</span>
 <p>Swap the value at two index in list</p>