Function bfs

javascript/0078-subsets.js:41–53

(nums, subsets = [[]])

};

const bfs = (nums, subsets = [[]]) => {
    for (const num of nums) {
        const levels = subsets.length;

        for (let level = 0; level < levels; level++) {
            const nextLevel = [...subsets[level], num];

            subsets.push(nextLevel);
        }
    }

    return subsets;
};