Use of .apply() with 'new' operator. Is this possible?

Question

In JavaScript, I want to create an object instance (via the new operator), but pass an arbitrary number of arguments to the constructor. Is this possible?

Answer 1

This constructor approach works both with and without the new keyword:

function Something(foo, bar){
  if (!(this instanceof Something)){
    var obj = Object.create(Something.prototype);
    return Something.apply(obj, arguments);
  }
  this.foo = foo;
  this.bar = bar;
  return this;
}

It assumes support for Object.create but you could always polyfill that if you're supporting older browsers. See the support table on MDN here.

Here's a JSBin to see it in action with console output.