magnetar/fe_calckey/frontend/client/src/scripts/shuffle.ts

/**
 * 配列をシャッフル (破壊的)
 */
export function shuffle<T extends any[]>(array: T): T {
    let currentIndex = array.length;
    let 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;
}