diff --git a/langext/array.go b/langext/array.go
index 3a28739..af12982 100644
--- a/langext/array.go
+++ b/langext/array.go
@@ -265,6 +265,14 @@ func ArrMap[T1 any, T2 any](arr []T1, conv func(v T1) T2) []T2 {
 	return r
 }
 
+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 {
+		r[i] = conv(i, v)
+	}
+	return r
+}
+
 func ArrFilterMap[T1 any, T2 any](arr []T1, filter func(v T1) bool, conv func(v T1) T2) []T2 {
 	r := make([]T2, 0, len(arr))
 	for _, v := range arr {