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JavaScript Weekly Issue 130
May 17, 2013
Welcome to issue 130 of JavaScript Weekly. Axel will be taking a well earned break for a few weeks as of next week (and joining me at O'Reilly Fluent!) so I'll be back at the helm for a bit! See you next week - Peter C.
Featured
Polymer: Google’s New Framework Built On Web Components Polymer is a new user interface framework from Google that is currently in pre-alpha mode (i.e., not yet ready for public consumption). It does many things natively that previously required custom infrastructures, by relying on upcoming HTML5 and ECMAScript features (that are already available in some browsers and can sometimes be polyfilled): Web Components, DOM mutation events, Object.observe(), Pointer Events, Web Animations, etc.
JavaScript Regular Expression Enlightenment Cody Lindley has written a superb introduction to JavaScript’s regular expression support, with lots of tables and tools.
ECMAScript 6 Draft Spec Revision 15 Now Available The specification of the next version of JavaScript evolves continually. Highlights of the latest draft: symbols are now a primitive, there is a new iteration protocol. New functions and methods: Math.imul (needed by asm.js), Object.setPrototypeOf(), Array.prototype.find(), Array.prototype.findIndex().
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Reading
Apple’s New Objective-C to JavaScript Bridge WebKit has long had the ability to let Objective-C call JavaScript and vice versa. A few months ago, Apple has added a new bridge API to the project. It is currently private, but might be made public at Apple’s WWDC Conference in mid-June. The article has details on how the API works and what it can be used for.
Building a Spreadsheet in 20 Minutes with Angular.js A short, sweet, and effective tutorial from Thomas Street.
Thomas Street
Building A Full-Text Index In JavaScript A tutorial that uses the in-RAM text search engine lunr.js and Mozilla’s pdf.js to extract text from PDF files.
Overwhelmed by JavaScript Dependencies A basic introduction to dependency management and modules in JavaScript (Node.js, RequireJS, bower).
Debug Your Node.js Code A few tips from Sindre Sorhus.
(Mostly) Painlessly Migrating A 3D Game Engine to TypeScript An interesting story.
Tutorial: Real Time Chat With NodeJS, Socket.io and ExpressJS
An Introduction to _.map() and _.reduce() in JavaScript Article for beginners, explaining the Underscore.js functions map() and reduce(). They are equivalent to Array.prototype.map() and Array.prototype.reduce(), which are part of JavaScript, as of ECMAScript 5.
Inline Source Maps When you compile code to JavaScript (including normal JavaScript to minified JavaScript), you can provide a source map whose data allows modern browsers to debug the compiled JavaScript via the original code. The source map is attached to the compiled JavaScript by appending a comment with a link. The web page mentions a neat little feature: You can inline the source map by using a data URI.
Statically Compiling, Serving and Testing Code Via Grunt Targeted at CoffeeScript programmers.
Dynamic Binding in Ember.js Using Observers
Using Dispatch Tables to Avoid Conditionals in JavaScript
Watching
The Road to Node.js v1.0 Short 15 minute talk by Node.js gatekeeper and npm creator Isaac Z. Schlueter. He covers the state of Node, what will be improved in v1.0 and some of the philosophy guiding Node.js development.
The First TXJS 2013 Talks Are Online The first half of the talks from the TXJS conference (April 15, 2013) is online. More talks to come next week.
Releases
Meteor 0.6.3 Now uses WebSockets in most browsers for lower latency and better performance.
RequireJS 2.1.6
Code and Libraries
Bookshelf.js: Promise-Based Object-Relational Mapping for JavaScript Bockshelf.js is a promise-based object-relational mapping library for Node.js, based on the Knex query builder. It borrows some of Backbone’s foundations (Model, Collection) and provides transaction support, eager/nested-eager relation loading, and support for one-to-one, one-to-many, and many-to-many relations.
HeliosJS: In-Memory Graph Database for Modern Browsers
Augmented JavaScript: Preprocessor That Supports Several ECMAScript 6 Features Compiles a subset of ECMAScript 6 to current JavaScript. Supported new ES6 features: await, yield, for-of loops, arrow functions.
Codeblock.js: Insert Editable, Runnable JavaScript Code Blocks Into Your Web Page
List.js: Add Search, Sort and Flexibility to HTML Lists or Tables “Native” JavaScript, no dependencies on libraries.
Jquery.swatches: A jQuery Plugin That Turns A 1 Line DIV Into A Color Swatch
Coquette: A Micro Framework for JavaScript Games
zelect: jQuery Plugin for A Better 'select' Highlights: asynchronous paged loading of large option lists; initializable in a detached or hidden DOM node; programmatically selectable and changeable.
Showcase: ECMAScript 6 Being Used in Current JavaScript Projects
Mozilla Persona Example App with Express and CouchDB
grunt-release: Grunt Plugin for Automating The Release Steps of Your Node.js Library or Bower Component
tracing.js: Tracing Function Calls
Jobs
UI Developer at ClearFit Inc., Toronto, Ontario. Do you want to work for a venture-backed SaaS, pre-IPO company with a start-up mentality? We are looking for a front-end developer to raise our technical bar, who is dedicated to the creation of "wow" products.
Junior Software Engineer at Thinkful
We’re building the tools to deliver curricula, expertise, and live help so anyone can advance their career. As an engineer at Thinkful you’ll be working directly with both the founders to architect, build and grow our technology and our team. You'll learn new skills and apply them to help others do the same. Talent and curiosity matter more than raw skill. Experience is valued, but not as much as potential.
Last but not least..
The Elusive Universal Web Bytecode It’s a frequent and often passionately stated wish (especially by people who don’t like JavaScript): Lets replace JavaScript with a virtual machine that has universal bytecode; that would allow us to easily use any kind of programming language on the web. Alon Zakai (creator of Emscripten, co-creator of asm.js) explains that that wish is not realistic (currently, maybe ever). Furthermore, if you go through a list of what you’d want from universal bytecode then you’ll find that JavaScript source code already fulfills most of the items on that list.
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