상위 K 자주 사용하는 요소

var topKFrequent = function(nums, k) {
    var obj ={}
    for(let i=0;i<nums.length;i++){
        if(!obj[nums[i]]) {
            obj[nums[i]] = 1
        }else{
            obj[nums[i]] +=1
        }
    }
    console.log(Object.keys(obj), obj)
    let sortedKeys = Object.keys(obj).sort((a,b)=>obj[b]-obj[a]);
    console.log(sortedKeys)
    let results =[]
     for(let i = 0; i < k; i++){
         results.push(sortedKeys[i])
     }
    return results
};

console.log(topKFrequent([4,1,1,1,2,2],  2))