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Adds groupBy function

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Eric Amodio
2017-09-12 15:47:57 -04:00
parent ccc29e3dfc
commit ea6fdbaaf2
1 changed files with 9 additions and 0 deletions
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9
src/system/array.ts
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@@ -1,6 +1,15 @@
'use strict'; 'use strict';
export namespace Arrays { export namespace Arrays {
export function groupBy<T>(array: T[], accessor: (item: T) => any): T[] {
return array.reduce((previous, current) => {
const value = accessor(current);
previous[value] = previous[value] || [];
previous[value].push(current);
return previous;
}, Object.create(null));
}
export function uniqueBy<T>(array: T[], accessor: (item: T) => any, predicate?: (item: T) => boolean): T[] { export function uniqueBy<T>(array: T[], accessor: (item: T) => any, predicate?: (item: T) => boolean): T[] {
const uniqueValues = Object.create(null); const uniqueValues = Object.create(null);
return array.filter(_ => { return array.filter(_ => {