diff --git a/ifop/ifop.go b/ifop/ifop.go
new file mode 100644
index 0000000..233a667
--- /dev/null
+++ b/ifop/ifop.go
@@ -0,0 +1,16 @@
+package ifop
+
+// apache 2.0 guonaihong
+func If[T any](cond bool, t T) (zero T) {
+	if cond {
+		return t
+	}
+	return
+}
+
+func IfElse[T any](cond bool, ifVal T, elseVal T) T {
+	if cond {
+		return ifVal
+	}
+	return elseVal
+}
diff --git a/ifop/ifop_test.go b/ifop/ifop_test.go
new file mode 100644
index 0000000..d6387d3
--- /dev/null
+++ b/ifop/ifop_test.go
@@ -0,0 +1,20 @@
+package ifop
+
+// apache 2.0 guonaihong
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIf(t *testing.T) {
+	a := ""
+	assert.Equal(t, If(len(a) == 0, "default"), "default")
+}
+
+func TestIfElse(t *testing.T) {
+	a := ""
+	assert.Equal(t, IfElse(len(a) != 0, a, "default"), "default")
+	a = "hello"
+	assert.Equal(t, IfElse(len(a) != 0, a, "default"), "hello")
+}
diff --git a/radix/radix.go b/radix/radix.go
index 758096e..76dea99 100644
--- a/radix/radix.go
+++ b/radix/radix.go
@@ -1,5 +1,6 @@
 package radix
 
+// apache 2.0 guonaihong
 import (
 	"strings"
 	"unicode/utf8"
@@ -231,6 +232,5 @@ func (r *Radix[V]) Delete(k string) {
 
 // 返回长度
 func (r *Radix[V]) Len() int {
-
 	return r.length
 }