If there are a lot of tabs open in Google Chrome, it tends to become slow. Killing tabs by hand, via the Task Manager helps, but is tedious. The following bash script (by Sindre Sorhus) lets you conveniently kill all open tabs from the shell (OS X only):

Update 2013-09-14: New sections 1.2, 2 and 3.

This blog post explains when you should and should not put data in prototype properties.

This blog post examines JavaScript‘s type system. It answers questions such as: Is JavaScript dynamically typed? Weakly typed? What is coercion?

This blog post is a quick refresher of how objects can be protected in JavaScript. There are three levels of protection:

1. Preventing extensions is the weakest level,
2. sealing is stronger,
3. freezing is strongest.

In JavaScript, all objects are truthy [1], even new Boolean(false), empty arrays and empty objects:

    > Boolean(new Boolean(false))
    true
    > Boolean([])
    true
    > Boolean({})
    true

That is different from how objects are converted to number and string, where you can control the result by implementing the methods valueOf() and toString() [2].

Update 2013-11-28: There won’t be generator arrow functions in ECMAScript 6 (details).

In ECMAScript 5, one creates all callable entities via functions. ECMAScript 6 has more constructs for doing so. This blog post describes them.

This blog post describes when and how to use regular expressions whose flag /g is set and what can go wrong.
(If you want to read a more general introduction to regular expressions, consult [1].)

I recently asked on Twitter whether people knew any good directories for JavaScript libraries and got several good answers.

JavaScript has many great style guides. Thus, there is no need to write yet another one. Instead, this blog post describes commonly accepted meta style rules and conventions that I like that are controversial. The idea is to help you make a more informed decision about what is right for you.

This blog post first explains how modules work in ECMAScript 6, the next version of JavaScript. It then describes tools that allow you to already use them now.