diff --git a/langext/array.go b/langext/array.go
index 7f53a06..a4b875f 100644
--- a/langext/array.go
+++ b/langext/array.go
@@ -265,6 +265,26 @@ func ArrMap[T1 any, T2 any](arr []T1, conv func(v T1) T2) []T2 {
 	return r
 }
 
+func MapMap[TK comparable, TV any, TR any](inmap map[TK]TV, conv func(k TK, v TV) TR) []TR {
+	r := make([]TR, 0, len(inmap))
+	for k, v := range inmap {
+		r = append(r, conv(k, v))
+	}
+	return r
+}
+
+func MapMapErr[TK comparable, TV any, TR any](inmap map[TK]TV, conv func(k TK, v TV) (TR, error)) ([]TR, error) {
+	r := make([]TR, 0, len(inmap))
+	for k, v := range inmap {
+		elem, err := conv(k, v)
+		if err != nil {
+			return nil, err
+		}
+		r = append(r, elem)
+	}
+	return r, nil
+}
+
 func ArrMapExt[T1 any, T2 any](arr []T1, conv func(idx int, v T1) T2) []T2 {
 	r := make([]T2, len(arr))
 	for i, v := range arr {