JavaScriptでsleep sort

sleep_sort.js

function sleepSort(arr, cb) {
  var c = 0, result = [];
  for (var i = 0; i < arr.length; i++) {
    var n = arr[i];
    setTimeout(function(n) {
      result.push(n);
      c++;
      if (c >= arr.length) {
        cb(result);
      }
    }, n, n);
  }
}

sleepSort([5, 5, 4, 2, 6], function(d) {
  alert(d);
});