This post examines four ways in which values can be categorized in JavaScript: via the hidden property [[Class]], via the typeof operator, via the instanceof operator and via the function Array.isArray(). We’ll also look at the prototype objects of built-in constructors, which produce unexpected categorization results.

This blog post looks at the difference between responsive web design and adaptive web design. Before we can get started, we need to define another concept: progressive enhancement.

Today, Facebook introduced a new feature called “graph search”. This blog post explains what it is. It is based on the Verge’s liveblog of the event.

From November 27-29, 2012, the Ecma Technical Committee 39 (TC39, [1]) had another meeting, where decisions were made about ECMAScript.next (the code name for ECMAScript 6 [1]). This blog post summarizes and explains the highlights. It is based on Rick Waldrons excellent notes that he put up on GitHub. There is also a list of all 2ality posts on TC39 meetings.

Update 2014-08-04: Comprehensions won’t be in ECMAScript 6. There’s a chance that an updated version of them will be in ECMAScript 7 or later.

ECMAScript.next will have two kinds of comprehensions: array comprehensions and generator comprehensions. They allow one to quickly assemble an array or a sequence of elements. Comprehensions exist in many programming languages, for example: CoffeeScript, Python, Haskell, Clojure.

In languages whose syntax is derived from C (e.g.: C ← C++ ← Java ← JavaScript), two brace styles are most common: Allman style and 1TBS.

In JavaScript, there is an unfortunate overloading of the term “prototype”.

2012 has been a very productive JavaScript year for me:

I’m a big fan of blogs. After all, I’m writing one, myself. They are the contemporary version of a specialized newspaper. Regularly having new content is exciting and reading blogs is well supported by various apps, thanks to standardized publication formats such as RSS and Atom.