An implementation of R's rep function for Javascript Arrays

rep.js

Array.prototype.repeat = function(times, each) {
  if(!times){return this;}
  if(!each){each=1;}
  var that = this;
  var temp=Array(each*this.length);
  this.forEach(function(el, i){
    for(j = 0; j < each; j++){
      temp[i * each + j] = el;
    }
  });
  ret = temp;
  for(i = 1; i < times; i++){
    ret = ret.concat(temp);
  }
  return ret;
};