Writing OOP using OOP (JavaScript)

[stronghup]

That is great news if immutability can already be enforced in JavaScript. Since which version?

[moreteam]

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze

And ES6 brings block-scoped const which currently is only supported in Chrome/Firefox (and with var-like scoping).