Hello combinations

hello.js

(function (word) {
  word = word.split('');
  var combinations = [], max = factorial(word.length);

  function factorial (number) {
    if (number <= 1) return 1;
    return factorial(number - 1) * number;
  }

  !function () {
    var _word = word.sort(function (){
      return Math.random() - 0.5;
    }).join('');

    if (combinations.indexOf(_word) === -1) {
      console.log(_word);
      combinations.push(_word);
    }

    if (combinations.length < max) {
      setTimeout(arguments.callee, 0);
    } else {
      console.log('Ready');
    }
  }();
})('abcde');