11 lines
282 B
JavaScript
11 lines
282 B
JavaScript
const permutations = arr => {
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if (arr.length <= 2) return arr.length === 2 ? [arr, [arr[1], arr[0]]] : arr;
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return arr.reduce(
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(acc, item, i) =>
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acc.concat(
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permutations([...arr.slice(0, i), ...arr.slice(i + 1)]).map(val => [item, ...val])
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),
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[]
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);
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};
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module.exports = permutations; |