Javascript Array repeat(num)

Array.prototype.repeat = function(num) {
  var self = this;
  for (var i = 0; i < num; i++) {
    self = self.concat(self);
  }/*from ww w.  j  a  v  a 2 s . co m*/
  return self;
}

var arr = [1, 2, 3];
var ary = arr.repeat(1);
console.log(ary); // [ 1, 2, 3, 1, 2, 3 ]