context.js

// A way to use module pattern along with new keyword
function Foo() {
  this.baz = 4;
  function bar() {
    return this.baz;
  }
  return {
    "bar":bar.bind(this)
  };
}

var f = new Foo();

f.bar(); // 4

So, yes you could just mess about with Foo.prototype.bar = (....) but I don't like that syntax, and the result is the same using this much more familiar pattern. It also makes it much easier to change to a standard Revealing Module later down the line if need be.

@jamesallardice just pointed out that this won't return an instance, so f instanceof Foo is false >:(

https://twitter.com/james_allardice/status/448013229143629824