1
var canConstruct = function (ransomNote, magazine) {
2
  map = {};
3
  for (let i of magazine) {
4
    map[i] = (map[i] || 0) + 1;
5
  }
6
  for (let i of ransomNote) {
7
    if (!map[i]) {
8
      return false;
9
    }
10
    map[i]--;
11
  }
12
  return true;
13
};