2015-02-26

Iterables and iterators in ECMAScript 6

This blog post is outdated. Please read chapter “Iterables and iterators” in “Exploring ES6”.


This blog post is part of a series on iteration in ES6:

  1. Iterables and iterators in ECMAScript 6
  2. ES6 generators in depth

ECMAScript 6 introduces a new interface for iteration, Iterable. This blog post explains how it works, which language constructs consume data via it (e.g., the new for-of loop) and which sources provide data via it (e.g., arrays).

2015-02-17

A 90 minute overview of ECMAScript 6 (video)

On February 1, 2015, I held the 90 minute talk “Using ECMAScript 6 today” at the Rolling Scopes Conference in Minsk. A video recording of that talk is online:

2015-02-16

Vote for your favorite “Exploring ES6” cover!

There are two candidates for the cover of my upcoming book, “Exploring ES6”. You can now vote for your favorite. I’ll announce a winner in a week.

2015-02-15

Classes in ECMAScript 6 (final semantics)


Check out my book (free online): “Exploring ES6”. Updated version of this blog post: chapter “Classes”.


Recently, TC39 decided on the final semantics of classes in ECMAScript 6 [2]. This blog post explains how their final incarnation works. The most significant recent changes were related to how subclassing is handled.

2015-02-10

First details of my upcoming book on ES6

I’m glad that I can finally announce the first details of my upcoming book:

  • Title: Exploring ES6 – Upgrade to the next version of JavaScript
  • Website: ExploringJS.com
    • Go there to get more information and to subscribe to be notified when the book comes out.

Thanks to everybody who helped me figure out the title!

2015-02-07

Variables and scoping in ECMAScript 6

This blog post examines how variables and scoping are handled in ECMAScript 6 [1].

2015-02-04

Google SoundScript: faster OOP for JavaScript

Update 2015-02-05: More information – “Experimental New Directions for JavaScript” by Andreas Rossberg (slides in English).

Google is currently working on SoundScript, a way to speed up object-oriented programming in JavaScript. The content of this blog post is completely based on a recent talk [1] by Dmitry Lomov. That is, everything I have written here is inferred from those slides and may or may not be correct.

Note: This blog post describes first ideas, avenues that Google is exploring for making JavaScript OOP faster. The final version of SoundScript may look and work completely different.

2015-02-03

Try out Facebook’s Flow typechecker online

You can now try out Flow [1], Facebook’s typechecker for JavaScript, online, at tryflow.org.