Javascript Array select(filter)

Array.prototype.select = function(filter)
{
 var newArr = []//  w  w  w . j a va  2  s.c  om
 for (var i = 0; i< this.length; i++) {
  if(filter(this[i])){
   newArr.push(this[i]);
  }
    }
 return newArr;
}