update:intersect containsby utest

intersect.go

@@ -12,7 +12,7 @@ func Contains[T comparable](collection []T, element T) bool {
 }
 
 // ContainsBy returns true if predicate function return true.
-func ContainsBy[T any](collection []T, predicate func(T)bool) bool {
+func ContainsBy[T any](collection []T, predicate func(T) bool) bool {
 	for _, item := range collection {
 		if predicate(item) {
 			return true

intersect_test.go

@@ -16,6 +16,28 @@ func TestContains(t *testing.T) {
 	is.Equal(result2, false)
 }
 
+func TestContainsBy(t *testing.T) {
+	is := assert.New(t)
+
+	type a struct {
+		A int
+		B string
+	}
+
+	a1 := []a{a{A: 1, B: "1"}, a{A: 2, B: "2"}, a{A: 3, B: "3"}}
+	result1 := ContainsBy[a](a1, func(t a) bool { return t.A == 1 && t.B == "2" })
+	result2 := ContainsBy[a](a1, func(t a) bool { return t.A == 2 && t.B == "2" })
+
+	a2 := []string{"aaa", "bbb", "ccc"}
+	result3 := ContainsBy[string](a2, func(t string) bool { return t == "ccc" })
+	result4 := ContainsBy[string](a2, func(t string) bool { return t == "ddd" })
+
+	is.Equal(result1, false)
+	is.Equal(result2, true)
+	is.Equal(result3, true)
+	is.Equal(result4, false)
+}
+
 func TestSome(t *testing.T) {
 	is := assert.New(t)