add: slice insert index 0

test/basic/collection/collection_test.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"github.com/go-playground/assert/v2"
 	"sort"
 	"testing"
 )
@@ -86,3 +87,13 @@ func TestSlice(t *testing.T) {
 	cutSlice := testCase[2]
 	fmt.Printf("cutSlice=%v", cutSlice)
 }
+
+// 在切片前面添加新元素
+func TestInsertIndex0(t *testing.T) {
+	original := []int{2, 3, 4}
+	newElement := 1
+
+	updated := append([]int{newElement}, original...)
+	assert.Equal(t, updated, []int{1, 2, 3, 4})
+	fmt.Println(updated) // 输出: [1 2 3 4]
+}