diff --git a/bench/decorator-bench_test.go b/bench/decorator-bench_test.go
index 48937f7..2a4a547 100644
--- a/bench/decorator-bench_test.go
+++ b/bench/decorator-bench_test.go
@@ -36,6 +36,7 @@ var (
 )
 
 func benchmark(b *testing.B, f func(int) UserInfo) {
+	b.Helper()
 	for i := 0; i < b.N; i++ {
 		f(50)
 	}
diff --git a/examples/decorator-err_test.go b/examples/decorator-err_test.go
index 2d0f945..684fa65 100644
--- a/examples/decorator-err_test.go
+++ b/examples/decorator-err_test.go
@@ -55,7 +55,7 @@ func TestNeedCacheErrWithTTL(t *testing.T) {
 		if age <= 0 {
 			return UserInfo{}, errors.New("invalid age")
 		}
-		return UserInfo{Name: "Anonymous", Age: 9}, nil
+		return UserInfo{Name: "Anonymous", Age: age}, nil
 	}
 	// 1. Cacheable Function
 	getUserAndErrCached := gofnext.CacheFn1Err(getUserAndErr, &gofnext.Config{
diff --git a/examples/decorator-key_test.go b/examples/decorator-key_test.go
index 34ac33f..dd23547 100644
--- a/examples/decorator-key_test.go
+++ b/examples/decorator-key_test.go
@@ -43,14 +43,14 @@ func TestCacheFuncKeyStruct(t *testing.T) {
 	}
 }
 func TestCacheFuncKeyStructUnexportedKey(t *testing.T) {
-    type info struct{
-        name string // unexported field
-    }
+	type info struct {
+		name string // unexported field
+	}
 
 	type UserInfo struct {
-        info struct{
-            name string // unexported field
-        }
+		info struct {
+			name string // unexported field
+		}
 	}
 	// Original function
 	getUserName := func(user UserInfo, flag *string) string {
@@ -58,10 +58,10 @@ func TestCacheFuncKeyStructUnexportedKey(t *testing.T) {
 	}
 
 	// Cacheable Function
-	getUserName2 := gofnext.CacheFn2(getUserName, )
+	getUserName2 := gofnext.CacheFn2(getUserName)
 
 	// Execute the function
-    flag := "flag"
+	flag := "flag"
 	name := getUserName2(UserInfo{info{name: "Alex"}}, &flag)
 	if name != "Alex" {
 		t.Errorf("name should be 'Alex', but get %s", name)
diff --git a/examples/decorator_test.go b/examples/decorator_test.go
index 0e01a87..2b60e5c 100644
--- a/examples/decorator_test.go
+++ b/examples/decorator_test.go
@@ -99,6 +99,38 @@ func TestCacheFuncWith3Params(t *testing.T) {
 	}
 }
 
+func TestCacheCtxFuncWith3Params(t *testing.T) {
+	// Original function
+	executeCount := 0
+	sum := func(ctx context.Context, b, c int) int {
+		executeCount++
+		time.Sleep(10 * time.Millisecond)
+		return b + c
+	}
+
+	// Cacheable Function
+	sumCache := gofnext.CacheFn3(sum, &gofnext.Config{
+		TTL: time.Hour,
+	}) // accept 3 parameter
+
+	// Execute the function multi times in parallel.
+	parallelCall(func() {
+		ctx := context.Background()
+		score := sumCache(ctx, 3, 5)
+		if score != 8 {
+			t.Errorf("score should be 99, but get %d", score)
+		}
+		ctx = context.Background()
+		sumCache(ctx, 3, 5)
+		ctx = context.Background()
+		sumCache(ctx, 3, 6)
+	}, 5)
+
+	if executeCount != 2 {
+		t.Errorf("executeCount should be 2, but get %d", executeCount)
+	}
+}
+
 // Cache Function with more parameter(>3)
 func TestCacheFuncWithMoreParams(t *testing.T) {
 	executeCount := 0
@@ -110,8 +142,8 @@ func TestCacheFuncWithMoreParams(t *testing.T) {
 	}
 
 	// Original function
-	fn := func(name string, age, gender, height int) int {
-		_ = age+ gender+ height
+	getUserScoreOrigin := func(name string, age, gender, height int) int {
+		_ = age + gender + height
 		executeCount++
 		// select score from db where name=name and age=age and gender=gender
 		switch name {
@@ -124,23 +156,23 @@ func TestCacheFuncWithMoreParams(t *testing.T) {
 
 	// Convert to extra parameters to a 1 parameter(2 or 3 prameters)
 	fnWrap := func(arg Stu) int {
-		return fn(arg.name, arg.age, arg.gender, arg.height)
+		return getUserScoreOrigin(arg.name, arg.age, arg.gender, arg.height)
 	}
 
 	// Cacheable Function
 	fnCachedInner := gofnext.CacheFn1(fnWrap)
-	fnCached := func(name string, age, gender, height int) int {
+	getUserScore := func(name string, age, gender, height int) int {
 		return fnCachedInner(Stu{name, age, gender, height})
 	}
 
 	// Execute the function multi times in parallel.
 	parallelCall(func() {
-		score := fnCached("Alex", 20, 1, 160)
+		score := getUserScore("Alex", 20, 1, 160)
 		if score != 10 {
 			t.Errorf("score should be 10, but get %d", score)
 		}
-		fnCached("Jhon", 21, 0, 160)
-		fnCached("Alex", 20, 1, 160)
+		getUserScore("Jhon", 21, 0, 160)
+		getUserScore("Alex", 20, 1, 160)
 	}, 10)
 
 	// Test count
@@ -148,35 +180,3 @@ func TestCacheFuncWithMoreParams(t *testing.T) {
 		t.Errorf("executeCount should be 2, but get %d", executeCount)
 	}
 }
-
-func TestCacheCtxFuncWith3Params(t *testing.T) {
-	// Original function
-	executeCount := 0
-	sum := func(ctx context.Context, b, c int) int {
-		executeCount++
-		time.Sleep(10 * time.Millisecond)
-		return b + c
-	}
-
-	// Cacheable Function
-	sumCache := gofnext.CacheFn3(sum, &gofnext.Config{
-		TTL: time.Hour,
-	}) // accept 3 parameter
-
-	// Execute the function multi times in parallel.
-	parallelCall(func() {
-		ctx := context.Background()
-		score := sumCache(ctx, 3, 5)
-		if score != 8 {
-			t.Errorf("score should be 99, but get %d", score)
-		}
-		ctx = context.Background()
-		sumCache(ctx, 3, 5)
-		ctx = context.Background()
-		sumCache(ctx, 3, 6)
-	}, 5)
-
-	if executeCount != 2 {
-		t.Errorf("executeCount should be 2, but get %d", executeCount)
-	}
-}
diff --git a/funcs.go b/funcs.go
new file mode 100644
index 0000000..7af6de7
--- /dev/null
+++ b/funcs.go
@@ -0,0 +1,8 @@
+package gofnext
+
+func If[T any](condition bool, trueVal, falseVal T) T {
+	if condition {
+		return trueVal
+	}
+	return falseVal
+}
diff --git a/version b/version
index cce2b1f..70be42f 100644
--- a/version
+++ b/version
@@ -1 +1 @@
-v0.0.22
\ No newline at end of file
+v0.0.23
\ No newline at end of file