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  1. asm.js Speedups Everywhere

    • by and • asm.js, Featured Article, Games, JavaScript • 3 comments

    asm.js is an easy-to-optimize subset of JavaScript. It runs in all browsers without plugins, and is a good target for porting C/C++ codebases such as game engines – which have in fact been the biggest adopters of this approach, for example Unity 3D and Unreal Read more…

  2. Synchronous Execution and Filesystem Access in Emscripten

    • by • asm.js, Featured Article, JavaScript • 2 comments

    Emscripten helps port C and C++ code to run on the Web. When doing such porting, we have to work around limitations of the web platform, one of which is that code must be asynchronous: you can’t have long-running code on the Web, it must Read more…

  3. What’s new in Web Audio

    • by and • Audio, Featured Article, JavaScript, WebAPI • 2 comments

    Introduction It’s been a while since we said anything on Hacks about the Web Audio API. However, with Firefox 37/38 hitting our Developer Edition/Nightly browser channels, there are some interesting new features to talk about! This article presents you with some new Web Audio tricks Read more…

  4. Embedding an HTTP Web Server in Firefox OS

    • by • Device APIs, Featured Article, Firefox OS, JavaScript, P2P Web, WebAPI • 14 comments

    Nearing the end of last year, Mozilla employees were gathered together for a week of collaboration and planning. During that week, a group was formed to envision what the future of Firefox OS might be surrounding a more P2P-focused Web. In particular, we’ve been looking Read more…

  5. From Map/Reduce to JavaScript Functional Programming

    • by • JavaScript • 5 comments

    Since ECMAScript 5.1, Array.prototype.map & Array.prototype.reduce were introduced to major browsers. These two functions not only allow developers to describe a computation more clearly, but also to simplify the work of writing loops for traversing an array; especially when the looping code actually is for Read more…

  6. You can’t go wrong watching JavaScript talks

    • by • Firefox, JavaScript, Video • 3 comments

    Late last week, I was collecting suggestions for year-end Hacks blog posts. As she headed out for the winter holidays, apps engineer Soledad Penadés gifted me “a bunch of cool talks I watched this year.” In fact, it’s a curated collection of presentations from JSConf, Read more…

  7. Pseudo elements, promise inspection, raw headers, and much more – Firefox Developer Edition 36

    • by • CSS, Developer Tools, Featured Article, Firefox, HTML5, JavaScript • 3 comments

    Firefox 36 was just uplifted to the Developer Edition channel, so let’s take a look at the most important Developer Tools changes in this release. We will also cover some changes from Firefox 35 since it was released shortly before the initial Developer Edition announcement. Read more…

  8. Introducing the JavaScript Internationalization API

    • by • Featured Article, JavaScript, Standards • 14 comments

    Firefox 29 issued half a year ago, so this post is long overdue. Nevertheless I wanted to pause for a second to discuss the Internationalization API first shipped on desktop in that release (and passing all tests!). Norbert Lindenberg wrote most of the implementation, and Read more…

  9. QuaggaJS – Building a barcode-scanner for the Web

    • by and • Firefox OS, JavaScript • 7 comments

    Have your ever tried to type in a voucher code on your mobile phone or simply enter the number of your membership card into a web form? These are just two examples of time-consuming and error-prone tasks which can be avoided by taking advantage of Read more…

  10. MetricsGraphics.js – a lightweight graphics library based on D3

    • by • JavaScript • 4 comments

    MetricsGraphics.js is a library built on top of D3 that is optimized for visualizing and laying out time-series data. It provides a simple way to produce common types of graphics in a principled and consistent way. The library supports line charts, scatterplots, histograms, barplots and Read more…