A pattern (pun intended) - strict, non-strict mode, object.create

new.js

// Strict mode and non-strict mode
(function () {
  "use strict";

  function Foo(a, b, c) {
    if (!this instanceof Foo) {
      return new Foo(a, b, c);
    }
    this.a = a;
    this.b = b;
    this.c = c;
  }

  Foo.create = function () {
    new Foo();
  };

  Foo.create(1, 2, 3);         // works
  new Foo(1, 2, 3);            // works
  Foo(1, 2, 3);                // works
}());


// Object.create
(function () {
  "use strict";

  var foo
    ;

  function Foo() {
  }

  foo = Object.create(Foo, { a: 'bar', b: 'baz', c: 'corge' });
  foo.a; // bar
}());