gistfile1.txt

function Bit(a, b) {
  this.a = a;
  this.b = b;
}

function construct(constructor, args) {
  function F() {
    return constructor.apply(this, args);
  }
  F.prototype = constructor.prototype;
  return new F();
}

var one = new Bit(1, 2);
var two = construct(Bit, [1, 2]);

It would be nice also if you could use construct without the explicit array, like this.