isAnagram.js

var countLetters = function(s){
  var letters = {};
  for(var i = 0; i < s.length; i++){
    var letter = s[i];
    if(letter == " ") continue;
    letters[letter] = (letters[letter] || 0) + 1;
  }
  return letters;
};

var isAnagram = function(s1, s2){
  s1 = s1.toLowerCase().trim();
  s2 = s2.toLowerCase().trim();

  if(s1 === s2){
    return false;
  }

  return _.eq(countLetters(s1), countLetters(s2));
};

// Для тех кто не хочет подключать lodash
// http://stackoverflow.com/questions/1068834/object-comparison-in-javascript
var _ = {
  eq: function(a,b){
    for(var i in a) {
      if(b[i] != a[i]) return false;
    }
    for(var i in b) {
      if(b[i] != a[i]) return false;
    }
    return true;
  }

};


console.log(isAnagram("стационар", "соратница"));
console.log(isAnagram("покраснение", "пенсионерка"));
console.log(isAnagram("внимание", "Вениамин"));
console.log(isAnagram("апельсин", "спаниель"));
console.log(isAnagram("eleven plus two", "twelve plus one"));
console.log(isAnagram("statue of liberty", "built to stay free"));
console.log(isAnagram("older and wiser", "I learned words"));

// false
console.log(isAnagram("стационар", "стационар"));
console.log(isAnagram("стационар", "сортница"));
console.log(isAnagram("покранение", "пенсионерка"));
console.log(isAnagram("внимание", "Вениамина"));
console.log(isAnagram("eleven plus one", "спаниель"));
console.log(isAnagram("eleven plus one", "twelve plus one"));
console.log(isAnagram("statue of paris", "built to stay free"));
console.log(isAnagram("older and wiser", "you learned words"));