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 Language Abstractions
The other day I was looking at pyjamas (which bills itself as a GWT-like tool for Python). I was also reminded of the semi-recent release of Objective-J. Pyjamas, GWT, and Objective-J all hinge around a central concept: Abstracting away the authoring of JavaScript-heavy web applications by allowing the developer to program entirely in their natively language (be it Python, Java, or an Objective-C-
John Resig - JavaScript Performance Rundown
A new JavaScript Engine has hit the pavement running: The new V8 engine (powering the brand-new Google Chrome browser). There are now a ton of JavaScript engines on the market (even when you only look at the ones being actively used in browsers): JavaScriptCore: The engine that powers Safari/WebKit (up until Safari 3.1). SquirrelFish: The engine used by Safari 4.0. Note: The latest WebKit nightly
John Resig - Secrets of JavaScript Libraries (SXSW)
Today, at SXSW, I hosted a panel discussion on the “Secrets of JavaScript Libraries.” We set out to discuss the behind-the-scenes nitty-gritty code that powers the universal features of the most popular JavaScript libraries. I think the presentation went quite well. I think we could’ve, easily, done a 2 hour talk with all the content that we had (we had to chop off, at least, two sections at the e
John Resig - Bad Object Detection
A common technique for writing cross-browser JavaScript code is to detect the features that you wish to use before you actually use them. Good object detection is done on a case-by-case basis, analyzing each feature as it’s encountered. Some common examples of object detection: // Is XPath querying available? if ( document.evaluate ) {} // Does the element have style information? if ( element.styl
John Resig - Cross-Site XMLHttpRequest
I’ve just finished writing up some docs on the new Cross-Site XMLHttpRequest feature in Firefox 3. I was a little worried at first, but it definitely appears to be both easy-to-implement and easy-to-use. Specifically, it’s an implementation of the W3C Access Control working draft (which is respected by Firefox’s XMLHttpRequest). If you’re interested in giving it a try you should fire up your copy
John Resig - Secrets: Table of Contents
After all the terrific feedback that I received from my post on the Untold Secrets of JavaScript I began to compile a Table of Contents that would serve as a guide for the rest of my next book (final title or publisher as yet to be determined). I’d love some feedback as to the structure and contents of the full table of contents, as it stands: Introduction (Overview of the contents of the book; in
John Resig - Untold JavaScript Secrets
I might as well come right out and say it: I’m starting work on my second JavaScript book. My first one was something of a success; it has gotten great reviews and is in its 3rd or 4th printing (I lose count). I’m in the process of pulling together materials, building outlines, and talking with publishers to make this next one happen. I have another question, related to my previous one, that’ll he
John Resig - Javascript Diff Algorithm
Using an idea grabbed from a mailing list post, I implemented the diff algorithm discussed in the following paper (free registration required): P. Heckel, A technique for isolating differences between files Comm. ACM, 21, (4), 264–268 (1978). The implementation, itself, has two functions, one of which is recommended for use: diffString( String oldFile, String newFile ) This method takes two string
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