Files
openstapps/packages/collection-utils/src/key-by.ts
2023-12-05 10:36:04 +00:00

31 lines
1.1 KiB
TypeScript

/*
* Copyright (C) 2022 StApps
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <https://www.gnu.org/licenses/>.
*/
/**
* Create an object composed of keys generated from the results of running
* each element of collection thru iteratee. The corresponding value of
* each key is the last element responsible for generating the key. The
* iteratee is invoked with one argument: (value).
*/
export function keyBy<T>(collection: T[], key: (item: T) => string | number): Record<string, T> {
return collection.reduce(
(accumulator, item) => {
accumulator[key(item)] = item;
return accumulator;
},
{} as Record<string | number, T>,
);
}