MapError implemented

map.go

@@ -7,3 +7,15 @@ func Map[I, O any](slice []I, mapper func(I) O) []O {
 	}
 	return ret
 }
+
+func MapError[I, O any](slice []I, mapper func(I) (O, error)) ([]O, error) {
+	ret := make([]O, 0, len(slice))
+	for _, old := range slice {
+		new, err := mapper(old)
+		if err != nil {
+			return nil, err
+		}
+		ret = append(ret, new)
+	}
+	return ret, nil
+}