Question

I hope this question makes sense. Can I ever do something like the following:

function constructor_function() {...code...};

var a = new constructor_function();

a();

Answer 1

If a constructor returns an object, that will be the value of the new .. expression. A function is an object, so you do what you want:

function ConstructorFunction() {
    return function () { alert("A function!"); };
}

var a = new ConstructorFunction();

a();