Quoting Wikipedia:

A quine is a computer program which takes no input and produces a copy of its own source code as its only output.

@cowboy (Ben Alman) gives the following example for JavaScript:

    !function $(){console.log('!'+$+'()')}()

Why does the quine work? The above code uses several tricks.

Today, I’ve asked on Twitter:

JavaScript: single quotes versus double quotes. Any preferences?

And I got great answers. Two funny examples:

Update 2012-09-21: New in Sect. 4: using void for IIFEs, concatenating IIFEs.

This blog post looks at a syntactic distinction that is unfortunately quite important in JavaScript: the difference between expressions and statements.

This blog post takes a look at the empty regular expression.

JavaScript is widely used these days. But there are still many people who dislike it, which is why Dart and – to a lesser degree – CoffeeScript have passionate fans. Recently, Crockford, who has done much to establish JavaScript as a credible general-purpose programming language, called it “tragically important”. In this blog post, I argue that we should see JavaScript’s glass (cup?) as half full and not as half empty.

The “Zen of Python” is a mini style guide for Python code that is also interesting if you don’t program Python. Its abstract reads:

Long time Pythoneer Tim Peters succinctly channels the BDFL's [Benevolent Dictator For Life, a nickname of Python creator Guido van Rossum] guiding principles for Python's design into 20 aphorisms, only 19 of which have been written down.

Question: What object is not an instance of Object? Or, put differently: What value v makes the following three expressions true?

    typeof v === "object"
    v !== null
    !(v instanceof Object)

2012-08-24: JSReload now also supports Chrome/Mac.

This blog post explains how to use Node.js to reload a tab in Safari whenever a file changes. Alas, this solution only works on a Mac, because it relies on AppleScript to remotely control Safari. You can download it as project JSReload on GitHub.

Are you looking for an alternative to Facebook and Twitter? Do you think they should work more like email, with multiple servers, multiple apps, and the ability to move and back up your content? Then distributed social networks may interest you.