What's wrong with a JavaScript class whose constructor returns a function or an object

Question

When I use new to instainciate an instance of a certain class, I got the actual instance. When the constructor function has a return value, the new sen

Answer 1

Your code does raise an eyebrow. It does not make sense to me why you would return a static class in your constructor.

I think if you returned the actual instance it might make more sense to you but it isn't necessary.

example

function foo() {
    this.x = 1;
    return this;
}

var aFooInstance = new foo();

console.log(aFooInstance); // prints a instance of foo

However, you might want to have private variables so you can return an object like so, in this example you can also pass in the data to the constructor.

function foo(x) {

    var _x = x;

    this.getX = function(){ return _x;}      
}

var aFooInstance = new foo(1);

console.log(aFooInstance.getX()); // prints 1

I would suggest reading more on simple class instantiation.