Javascript Array Shuffle

// Fisher-Yates (aka Knuth) Shuffle
function knuth_shuffle(arr) {
  var currentIndex = arr.length;
  var randomIndex, temp;

  while(currentIndex > 0) {
    // get a random index from the current index
    randomIndex = Math.floor(Math.random() * currentIndex);
    currentIndex -= 1;//from w  w w . jav a 2 s  . co  m

    // swap those two elements
    temp = arr[currentIndex];
    arr[currentIndex] = arr[randomIndex];
    arr[randomIndex] = temp;
  }

  return arr;
}

var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
knuth_shuffle(arr);
console.log(arr);