Function backTrack

javascript/0046-permutations.js:24–28

(nums, i, permutation, permutations)

};

const backTrack = (nums, i, permutation, permutations) => {
    permutation.push(nums[i]);
    dfs(nums, permutation, permutations);
    permutation.pop();
};

/**
 * https://leetcode.com/problems/permutations/solution/