This is to show how to make a simple String Prototype for an anagram.

StringPrototypeAna.js

String.prototype.sortLetters = function() {
  return this.toLowerCase().split('').sort().join('');
}

var isAnagram = function(test, original) {
  return test.sortLetters() == original.sortLetters();
};

// This is to show how to make a simple String Prototype for an anagram.