added Map.groupBy

2023-09-26 17:54:04 +02:00
parent 089ac33d93
commit 641a4425aa
4 changed files with 20 additions and 0 deletions
@@ -0,0 +1,3 @@
+declare interface MapConstructor {
+  groupBy<K, V>(arr: V[], fn: (v: V) => K): Map<K, V[]>;
+}