diff --git a/langext/maps.go b/langext/maps.go
index a0e5b25..6f06ed4 100644
--- a/langext/maps.go
+++ b/langext/maps.go
@@ -7,3 +7,11 @@ func MapKeyArr[T comparable, V any](v map[T]V) []T {
 	}
 	return result
 }
+
+func ArrToMap[T comparable, V any](a []V, keyfunc func(V) T) map[T]V {
+	result := make(map[T]V, len(a))
+	for _, v := range a {
+		result[keyfunc(v)] = v
+	}
+	return result
+}