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noway.gabb.fr
1/**
2 * Split an array into two groups based on the result {@linkcode predicate}
3 *
4 * Items for which {@linkcode predicate} returns `true` will be in the "left"
5 * result, and the others in the "right" one
6 */
7export function partition<T>(
8 input: Array<T>,
9 predicate: (element: T) => boolean,
10): [Array<T>, Array<T>] {
11 const left: Array<T> = [];
12 const right: Array<T> = [];
13
14 for (const element of input) {
15 if (predicate(element)) {
16 left.push(element);
17 } else {
18 right.push(element);
19 }
20 }
21
22 return [left, right];
23}
24
25/**
26 * Deduplicate the elements of {@linkcode items} by their `id` property
27 */
28export function uniqueById<T extends { id: string }>(items: T[]): T[] {
29 const entries = items.map((item) => [item.id, item] as const);
30 const mapById = new Map<string, T>(entries);
31
32 return Array.from(mapById.values());
33}