JavaScript anagram comparison

Question

I\'m trying to compare two strings to see if they are anagrams.

My problem is that I\'m only comparing the first letter in each string. For example, \"Mary\" and \"

Answer 1

function validAnagramOrNot(a, b) {
      if (a.length !== b.length)
      return false;
      const lookup = {};
      for (let i = 0; i < a.length; i++) {
          let character = a[i];
          lookup[character] = (lookup[character] || 0) + 1;
      }
      for (let i = 0; i < b.length; i++) {
          let character = b[i];
          if (!lookup[character]) {
            return false;
          } else {
             lookup[character]--;
          }
       }
  return true;
}
 validAnagramOrNot("a", "b"); // false
 validAnagramOrNot("aza", "zaa"); //true