instantiating a member of a class with a variable number of constructor arguments

dynamic_instantiation.js

var F = function(){};
F.prototype = klass.prototype;
var o = new F();
klass.apply(o,arguments)
return o;

Hey Michael, when would you use this?

When you need to instantiate a member of a class with a variable number of arguments given to the constructor. I used it in one of my projects that lazily loaded classes when they were used. The lazy constructor had to be able to take any number of arguments and pass them through to the real constructor once it was loaded.