chore: for backward compatibility (#4852)

Signed-off-by: kevin <wanjunfeng@gmail.com>

core/stringx/strings.go

@@ -15,6 +15,12 @@ var (
 	ErrInvalidStopPosition = errors.New("stop position is invalid")
 )
 
+// Contains checks if str is in list.
+// Deprecated: use slices.Contains instead.
+func Contains(list []string, str string) bool {
+	return slices.Contains(list, str)
+}
+
 // Filter filters chars from s with given filter function.
 func Filter(s string, filter func(r rune) bool) string {
 	var n int

core/stringx/strings_test.go

@@ -7,6 +7,28 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+func TestContainsString(t *testing.T) {
+	cases := []struct {
+		slice  []string
+		value  string
+		expect bool
+	}{
+		{[]string{"1"}, "1", true},
+		{[]string{"1"}, "2", false},
+		{[]string{"1", "2"}, "1", true},
+		{[]string{"1", "2"}, "3", false},
+		{nil, "3", false},
+		{nil, "", false},
+	}
+
+	for _, each := range cases {
+		t.Run(path.Join(each.slice...), func(t *testing.T) {
+			actual := Contains(each.slice, each.value)
+			assert.Equal(t, each.expect, actual)
+		})
+	}
+}
+
 func TestNotEmpty(t *testing.T) {
 	cases := []struct {
 		args   []string

core/syncx/once.go

@@ -0,0 +1,9 @@
+package syncx
+
+import "sync"
+
+// Once returns a func that guarantees fn can only called once.
+// Deprecated: use sync.OnceFunc instead.
+func Once(fn func()) func() {
+	return sync.OnceFunc(fn)
+}

core/syncx/once_test.go

@@ -0,0 +1,33 @@
+package syncx
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestOnce(t *testing.T) {
+	var v int
+	add := Once(func() {
+		v++
+	})
+
+	for i := 0; i < 5; i++ {
+		add()
+	}
+
+	assert.Equal(t, 1, v)
+}
+
+func BenchmarkOnce(b *testing.B) {
+	var v int
+	add := Once(func() {
+		v++
+	})
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		add()
+	}
+	assert.Equal(b, 1, v)
+}