JavaScript’s typeof is a complicated beast – it can be used for many things, but also has many quirks. This post lists its use cases, points out problems and presents alternatives.

Update 2012-01-23: “ECMAScript 6 support in Mozilla” on the Mozilla Development Network.

The next version of ECMAScript (code-named ECMAScript.next [1]) will be standardized by 2013. This post enumerates the first features that are currently being tested in Firefox and Chrome.

This post shows you how to number HTML headings with CSS. That is, given the following HTML.

    <h1>My Article</h1>
    <h2>Introduction</h2>
    <h3>Rationale</h3>
    <h2>Background</h2>

With the proper CSS, the above will be displayed as

My Article
1. Introduction
1.1. Rationale
2. Background

GitHub has a nifty feature called GitHub Pages that allows you to serve files in your repository to the web. Those files have to reside in the branch gh-pages, which is different from the usual master branch. To avoid the slightly cumbersome maintenance of two branches, this post shows you how to only work with gh-pages.

Update 2012-03-19: New section on “Objects”, tips for what to read next.

This blog post illustrates several JavaScript inheritance topics via an example: We start with naive implementations of a constructor Point and its sub-constructor ColorPoint and then improve them, step by step.

Today, Douglas Crockford introduced a new project: JSDev. It solves a challenge with privacy: On one hand, you don’t want the outside world to have access to private functionality. On the other hand, you want to test it, via external unit tests.

JavaScript is Spartan when it comes to built-in data structures. One commonly uses objects as maps from strings to values. This post points out three pitfalls when doing so.

Both objects and arrays play multiple roles in JavaScript. This blog post explains what those roles are.

Allen Wirfs-Brock (the project editor of the ECMAScript 5 specification) recently mentioned the thought process behind method names such as Object.getOwnPropertyNames():

Update 2012-03-13: Added a section on installation.

Paul Miller’s es6-shim gives you functionality that will be in ECMAScript 6 (code-named ECMAScript.next), on ECMAScript 5 engines. It was initially based on a project of mine, but adds much new functionality, Node.js compatibility, and (not least) tests.