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Revert "refactor: 可読性のため一部でArray.prototype.atを使うように" (#115)

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* Revert "refactor: 可読性のため一部で`Array.prototype.at`を使うように (#11274)"

This reverts commit 2b6dbd4fcb.

* Apply suggestions from code review

---------

Co-authored-by: okayurisotto <okayurisotto@proton.me>
This commit is contained in:
まっちゃとーにゅ 2023-07-25 19:58:08 +09:00 • committed by GitHub
parent 3bde1b398a
commit 1e6389d990
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19 changed files with 36 additions and 38 deletions
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5
packages/frontend/src/scripts/array.ts
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@ -78,9 +78,8 @@ export function maximum(xs: number[]): number {
export function groupBy<T>(f: EndoRelation<T>, xs: T[]): T[][] {
const groups = [] as T[][];
for (const x of xs) {
const lastGroup = groups.at(-1);
if (lastGroup !== undefined && f(lastGroup[0], x)) {
lastGroup.push(x);
if (groups.length !== 0 && f(groups[groups.length - 1][0], x)) {
groups[groups.length - 1].push(x);
} else {
groups.push([x]);
}