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