js 数组全排列算法

/** * @function 数组排列组合 * [1,2,3] => 123 132 213 231 321 312 */ function permutationCombination(arr) { if (arr.length === 1) { return [arr]; }const res = []; arr.forEach((val, index) => { const childArr = [...arr]; childArr.splice(index, 1); res.push( ...permutationCombination(childArr).map(item => [val, ...item]) ); }); return res; }

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