Errol Burger

That is because at the time constructor is invoked with new, stranger is 2. Only after order.value is assigned does stranger become 3.

The self executing function may be overkill but maybe it's because I'm new to all of this that I'm finding the amusement in it:

var Order = (function(altConstructor) {
    var y = 10;
    return altConstructor || function Order(x){
      this.id = x;
      this.y = y
    }
})(
    (function(condition){ 
        /* return completely different constructor or null */ 
    })(condition)
);

Nice. I've grown fond of doing this:

var Order = (function() {
    // initialise some stuff before the return
    return function Order(x){
        this.id = x;
    }
})();

var order = new Order(1);