for prettier javascript

_extend.js

function _extend(obj) {
  var sources = Array.prototype.slice.call(arguments, 1);
  for (var i=0; i<sources.length; i++) {
    var source = sources[i];
    for (var prop in source) {
      obj[prop] = source[prop];
    }
  }
}

// usage...

var Stuff = function() {
};

_extend(Stuff.prototype, {
  method: function() {
    // do stuff
  }
});

var stuff = new Stuff();

stuff.method();