[Algorithm] 11 week(3.21 ~ 3.27) 3/3

1636. Sort Array by Increasing Frequency

var frequencySort = function(nums) {
    const map = new Map();
    
    for(let num of nums){
        map.set(num, (map.get(num) + 1) || 1);
    };
    
    return nums.sort((a, b) => (map.get(a) - map.get(b)) || b - a);
};