dmorenogogoleva · June 6, 2021 11:09 · Jun 6, 2021
diff --git a/groupBy.ts b/groupBy.ts
@@ -0,0 +1,15 @@
+export function groupBy(collection: any[], iteratee: string) {
+  return collection.reduce((result, value) => {
+    if (!value.hasOwnProperty(iteratee)) return result
+
+    const key = value[iteratee]
+
+    if (!result || !result[key]) {
+      result[key] = [value]
+      return result
+    }
+
+    result[key] = [...result[key], value]
+    return result
+  }, {})
+}