Function backTrack

javascript/0090-subsets-ii.js:26–30

(nums, i, set, subset)

};

const backTrack = (nums, i, set, subset) => {
    set.push(nums[i]);
    dfs(nums, i + 1, set, subset);
    set.pop();
};

/**
 * https://leetcode.com/problems/subsets-ii/