[rgl]

var MyArray = function() {
  var _myPrototype = {
    joinReverse : function(s) { return this.slice(0).reverse().join(s); }
  }
  return function() {
    var ret = Array.apply( null, arguments );
    for( var i in _myPrototype )
      // if( typeof _myPrototype[i] == "function" )
        ret[i] = _myPrototype[i];
    return ret;
  }
}();

var test = MyArray( 1, "bb", 333 );

alert( test.joinReverse( " - " ) );