John Resig - Asm.js: The JavaScript Compile Target
Like many developers I’ve been excited by the promise of Asm.js. Reading the recent news that Asm.js is now in Firefox nightly is what got my interest going. There’s also been a massive surge in interest after Mozilla and Epic announced (mirror) that they had ported Unreal Engine 3 to Asm.js – and that it ran really well. Getting a C++ game engine running in JavaScript, using WebGL for rendering,
John Resig - HTML 5 data- Attributes
A new feature being introduced in HTML 5 is the addition of custom data attributes. This is a, seemingly, bizarre addition to the specification – but actually provides a number of useful benefits. Simply, the specification for custom data attributes states that any attribute that starts with “data-” will be treated as a storage area for private data (private in the sense that the end user can’t se
John Resig - ECMAScript 5 Objects and Properties
ECMAScript 5 is on its way. Rising from the ashes of ECMAScript 4, which got scaled way back and became ECMAScript 3.1, which was then re-named ECMAScript 5 (more details)- comes a new layer of functionality built on top of our lovable ECMAScript 3. Update: I’ve posted more details on ECMAScript 5 Strict Mode, JSON, and More. There are a few new APIs included in the specification but the most inte
John Resig - ECMAScript 5 Strict Mode, JSON, and More
Previously I analyzed ECMAScript 5’s Object and Property system. This is a huge new aspect of the language and deserved its special consideration. There are a number of other new features and APIs that need attention, as well. The largest of which are Strict Mode and native JSON support. Strict Mode is a new feature in ECMAScript 5 that allows you to place a program, or a function, in a “strict” o
Learning Advanced JavaScript
Double-click the code to edit the tutorial and try your own code. This tutorial contains code and discussion from the upcoming book Secrets of the JavaScript Ninja by John Resig. Our Goal Goal: To be able to understand this function: // The .bind method from Prototype.js Function.prototype.bind = function(){ var fn = this, args = Array.prototype.slice.call(arguments), object = args.shift(); return
John Resig - JavaScript Micro-Templating
I’ve had a little utility that I’ve been kicking around for some time now that I’ve found to be quite useful in my JavaScript application-building endeavors. It’s a super-simple templating function that is fast, caches quickly, and is easy to use. I have a couple tricks that I use to make it real fun to mess with. Here’s the source code to the templating function (a more-refined version of this co
John Resig - Computing with JavaScript Web Workers
Web Workers are, undoubtedly, the coolest new feature to arrive in the latest version of web browsers. Web Workers allow you to run JavaScript in parallel on a web page, without blocking the user interface. Normally in order to achieve any sort of computation using JavaScript you would need to break your jobs up into tiny chunks and split their execution apart using timers. This is both slow and u
John Resig - FireUnit: JavaScript Unit Testing Extension
In my work with the Firebug team over the past couple months I’ve been working with Jan Odvarko on a way to provide some form of unit testing that we can build off of. The result of my work is a new Firefox/Firebug extension called FireUnit. FireUnit provides a simple JavaScript API for doing simple test logging and viewing within a new tab of Firebug. For example, here’s some of the API that you
John Resig - JavaScript iPhone Apps
I’ve been watching, with interest, developers create new applications for the iPhone. Owning one myself – and being knowledgeable in JavaScript – I’ve been wondering what options there were for creating downloadable JavaScript applications or the iPhone. In doing some research I found a number of solutions, some simpler than others, some requiring more knowledge of Objective-C than others. Before
John Resig - The World of ECMAScript
So I did a little bit of digging and I’ve pulled together something fun: I call it “The World of ECMAScript“. It’s a full map detailing everything that exists within the world of ECMAScript (with JavaScript, ActionScript, and JScript being its most-famous implementations). Right now I’m only showing things that can be built on top of (languages, engines, browsers, servers, etc.) – not end user app
John Resig - Bringing the Browser to the Server
This weekend I took a big step in upping the ante for JavaScript as a Language. At some point last Friday evening I started coding and didn’t stop until sometime mid-Monday. The result is a good-enough browser/DOM environment, written in JavaScript, that runs on top of Rhino; capable of running jQuery, Prototype, and MochiKit (at the very least). The implications of this are phenomenal, and I’m no
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http://ejohn.org/apps/jquery2/