String.prototype.repeat Shim

repeat-shim.js

// Repeat Shim
String.prototype.repeat = String.prototype.repeat || function(count) {
  // temporary return array
  var ret = []; 
  // count to count
  for(var i = 0; i < count; i++) {
    // push this (the string we want to repeat)
    // into the array
    ret.push(this);
  }
  // use Array.prototype.join to concat
  // all the string together.
  return ret.join('');
};