Class keyword in Javascript

Question

According to this article it should be a Javascript 2.0 way to define class. However, I never saw that in practice. Thus the question. How to use class keyword and what is t

Answer 1

Just to add the ECMA5 way of class making.

Note that it does not have a constructor function this way (but you can trigger an init function if you like)

var Class = {
      el: null,
      socket: null,

      init: function (params) {

        if (!(this.el instanceof HTMLElement)) {
          throw new Error('Chat room has no DOM element to attach on.');
        }

        return this.doStuff();

      },
      doStuff: function (params) {
        return this;
      }
};

var instanceofClass = Object.create(Class, {
  el: {
    value: document.body.querySelector('.what ever')
  },
  someMoreData: {
    value: [0,5,7,3]
  }
}).init();