misskey/packages/frontend/src/scripts/shuffle.ts
2022-12-27 14:36:33 +09:00

19 lines
491 B
TypeScript

/**
* 配列をシャッフル (破壊的)
*/
export function shuffle<T extends any[]>(array: T): T {
let currentIndex = array.length, randomIndex;
// While there remain elements to shuffle.
while (currentIndex !== 0) {
// Pick a remaining element.
randomIndex = Math.floor(Math.random() * currentIndex);
currentIndex--;
// And swap it with the current element.
[array[currentIndex], array[randomIndex]] = [
array[randomIndex], array[currentIndex]];
}
return array;
}