Javascript Array plumInArray(e)

Array.prototype.plumInArray = function(e){
  var inArray = false; 
  //console.log(this, typeof this);
  for(var i = 0, len = this.length; i<len; i++){
    if(e === this[i]){
      inArray = true;//from   ww  w. j a  va 2 s.  c  o m
      break;
    }
  }
  return inArray;
};