lib.es2024.collection.d.ts (1224B)
1 /*! ***************************************************************************** 2 Copyright (c) Microsoft Corporation. All rights reserved. 3 Licensed under the Apache License, Version 2.0 (the "License"); you may not use 4 this file except in compliance with the License. You may obtain a copy of the 5 License at http://www.apache.org/licenses/LICENSE-2.0 6 7 THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 8 KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED 9 WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE, 10 MERCHANTABLITY OR NON-INFRINGEMENT. 11 12 See the Apache Version 2.0 License for specific language governing permissions 13 and limitations under the License. 14 ***************************************************************************** */ 15 16 17 /// <reference no-default-lib="true"/> 18 19 interface MapConstructor { 20 /** 21 * Groups members of an iterable according to the return value of the passed callback. 22 * @param items An iterable. 23 * @param keySelector A callback which will be invoked for each item in items. 24 */ 25 groupBy<K, T>( 26 items: Iterable<T>, 27 keySelector: (item: T, index: number) => K, 28 ): Map<K, T[]>; 29 }