John Resig - Write Code Every Day
Last fall, work on my coding side projects came to a head: I wasn’t making adequate progress and I couldn’t find a way to get more done without sacrificing my ability to do effective work at Khan Academy. There were a few major problems with how I was working on my side projects. I was primarily working on them during the weekends and sometimes in the evenings during the week. This is a strategy t
John Resig - Node.js Stream Playground
This summer I had the opportunity to attend NodeConf and it was a fantastic experience. I really appreciated how every session was a hands-on coding session: I felt like I walked away knowing how to put a bunch of advice directly into practice. One of my favorite sessions was the one run by James Halliday and Max Ogden exploring Node streams. Specifically they sat us down and had us run through th
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 - 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 - Blog
Twitter vs. Mastodon Some context on Mastodon, after a couple weeks of exploring it – I’m sure I’m missing a lot, but this is my understanding of the tech, so far. I’ve been an avid user of Twitter so most of my knowledge comes by comparing Mastodon to Twitter. You can follow me on Mastodon here: https://mastodon.social/@jeresig Your […] Comment · Posted: November 27th, 2022 10th Anniversary of jQ
John Resig - How JavaScript Timers Work
At a fundamental level it’s important to understand how JavaScript timers work. Often times they behave unintuitively because of the single thread which they are in. Let’s start by examining the three functions to which we have access that can construct and manipulate timers. var id = setTimeout(fn, delay); – Initiates a single timer which will call the specified function after the delay. The func
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 - Redefining the Introduction to Computer Science
I’m incredibly excited to take this opportunity to announce a new project that I’ve been leading here at Khan Academy: Khan Academy Computer Science. We’re releasing a completely new platform that targets people with no programming knowledge and gives them an engaging and fun environment to learn in. Over everything else we wanted to emphasize creativity and exploration and make it approachable fo
John Resig - JavaScript as a First Language
At Khan Academy we’ve been investigating teaching Computer Science to students in some new and interesting ways. The most interesting aspect of which is that we’re likely going to be teaching them JavaScript as their first language. We’re in a very unique position as we’re primarily aiming to teach students who’ve been through our previous math and science-centric curriculum. Because of this we ca
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 Trie Performance Analysis
After my last post discussing dictionary lookups in JavaScript the unanimous consensus seemed to be that utilizing Trie would result in additional space savings and yield performance benefits. A Trie is a relatively simple data structure. At its simplest form you’re building a tree-like structure where each final leaf results in a complete word. This allows for some very efficient use of file size
John Resig - JavaScript Method Overloading
In a side project that I’ve been working on I built a quick-and-dirty function for doing simple method overloading. For those of you who aren’t familiar with, it’s just a way of mapping a single function call to multiple functions based upon the arguments they accept. Here’s the function in question: // addMethod - By John Resig (MIT Licensed) function addMethod(object, name, fn){ var old = object
John Resig - Learning from Twitter
An issue popped up on Twitter this past week that caused the web site to be generally unusable for many users. It appears as if attempts to scroll were unbearably slow and caused the site to be unresponsive. The Twitter team investigated and determined that if they reverted the version of jQuery that they used back to 1.4.2 from 1.4.4 the site would be responsive again. After more investigation th
John Resig - JavaScript Testing Does Not Scale
(This is a follow-up on my portion of the More Secrets of JavaScript Libraries panel at SXSW.) It’s become increasingly obvious to me that cross-browser JavaScript development and testing, as we know it, does not scale. jQuery’s Test Suites Take the case of the jQuery core testing environment. Our default test suite is an XHTML page (served with the HTML mimetype) with the correct doctype. In incl
John Resig - JavaScript Programmer
John Resig is best known as an expert in the JavaScript programming language and the creator of the most popular JavaScript library in the world: jQuery. He’s created numerous JavaScript projects that continue to be integral parts of modern day web development. He’s also the author of the popular JavaScript books: Secrets of the JavaScript Ninja, Pro JavaScript Techniques, and The GraphQL Guide. J
John Resig - Blog
Twitter vs. Mastodon Some context on Mastodon, after a couple weeks of exploring it – I’m sure I’m missing a lot, but this is my understanding of the tech, so far. I’ve been an avid user of Twitter so most of my knowledge comes by comparing Mastodon to Twitter. You can follow me on Mastodon here: https://mastodon.social/@jeresig Your […] Comment · Posted: November 27th, 2022 10th Anniversary of jQ
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