Javascript Array toForty()

Array.prototype.toForty = function(){
    var start = 2;
    var end = 40;

    for(var i = start; i <= end; i += 2){
        this.push(i);//from   w w  w .  ja  v a 2s  . c  o m
    }
   return this;
}

var oneToForty = [].toForty();


console.log(oneToForty);

Array.prototype.toForty  = function() {
  return Array.range(40, 2);
};

Array.prototype.toForty = function(){
  b = [];//ww w . j  a  v  a2  s . co  m
  for(i=2; i<=40; i+=2){
    b.push(i);
  }
  return b
}