feat: add KeyBy for slice

slice/slice.go

@@ -833,3 +833,15 @@ func AppendIfAbsent[T comparable](slice []T, value T) []T {
 	}
 	return slice
 }
+
+// KeyBy converts a slice to a map based on a callback function
+func KeyBy[T any, U comparable](slice []T, iteratee func(T) U) map[U]T {
+	result := make(map[U]T, len(slice))
+
+	for _, v := range slice {
+		k := iteratee(v)
+		result[k] = v
+	}
+
+	return result
+}

slice/slice_test.go

@@ -644,3 +644,13 @@ func TestReplaceAll(t *testing.T) {
 	assert.Equal([]string{"x", "b", "x", "c", "d", "x"}, ReplaceAll(strs, "a", "x"))
 	assert.Equal([]string{"a", "b", "a", "c", "d", "a"}, ReplaceAll(strs, "e", "x"))
 }
+
+func TestKeyBy(t *testing.T) {
+	assert := internal.NewAssert(t, "TestKeyBy")
+
+	result := KeyBy([]string{"a", "ab", "abc"}, func(str string) int {
+		return len(str)
+	})
+
+	assert.Equal(result, map[int]string{1: "a", 2: "ab", 3: "abc"})
+}