anagram.js

function Anagram(word) {
  this.word = word;
}

Anagram.prototype.match = function(words) {
  return words.filter(function(word) {
    return areAnagrams(this.word, word);
  }, this);
};

function areAnagrams(word1, word2) {
  word1 = word1.toLowerCase();
  word2 = word2.toLowerCase();
  return word1 !== word2 && haveSameLetters(word1, word2);
}

function haveSameLetters(word1, word2) {
  return sorted(word1) == sorted(word2);
}

function sorted(str) {
  return str.split('').sort().join('');
}

module.exports = Anagram;