Check if All Characters Have Equal Number of Occurrences LeetCode solution in JavaScript

1
var areOccurrencesEqual = function (s) {
2
  var freq = {};
3
  for (let c of s) freq[c] = (freq[c] || 0) + 1;
4
  var val = freq[s[0]];
5
  for (let c in freq) if (freq[c] && freq[c] != val) return false;
6
  return true;
7
};