LeetCode 179. Largest Number

const largestNumber = (nums) => {
    const ans = nums.map(a => a.toString())
        // .sort((a, b) => (a + b) - (b + a))
        // .reduce((prev, curr) => curr + prev);
        .sort((a, b) => (b + a) - (a + b))
        .join('')
    return ans[0] == '0' ? '0' : ans;
};