--- title: "This week's JavaScript news, issue 224" publication: "JavaScript Weekly" issue: 224 published_at: "2015-03-20" canonical_url: "https://javascriptweekly.com/issues/224" --- This week's JavaScript news, issue 224 DevTools State of the Union, an interactive Angular tutorial, ng-conf videos, and more. — [Read this e-mail on the Web](http://javascriptweekly.com/issues/224) JavaScript WeeklyIssue 224 — March 20, 2015[Building The Facebook News Feed With Relay](http://facebook.github.io/react/blog/2015/03/19/building-the-facebook-news-feed-with-relay.html) Relay is a new framework for building data-driven apps with React, and this article covers the basic concepts of building a Facebook news feed with it. Joseph Savona [Chrome DevTools: State Of The Union 2015](https://speakerdeck.com/addyosmani/devtools-state-of-the-union-2015) Quality annotated slides from Google’s Addy Osmani showing the latest DevTools goodies like paint profiling, animation inspection and updates to the JS editing workflow with V8. A must see. Addy Osmani [Angular Basics, An Interactive Book for Learning Angular](http://www.angularjsbook.com/) Includes a live coding environment and editable, live examples. The author calls it a book but it’s really an _experience_. Chris Smith [![Frontline Systems Inc.\](https://copm.s3.amazonaws.com/d19ae734.jpg)](https://rason.com/?utm_source=jsweekly&utm_medium=email&utm_campaign=mar20)[Try RASON™ – RESTful Analytic Solver™ Object Notation for Web/Mobile Apps](https://rason.com/?utm_source=jsweekly&utm_medium=email&utm_campaign=mar20)Be the first to try the [RASON](https://rason.com/?utm_source=jsweekly=email=mar20)™ beta – the super-easy way to solve powerful optimization and simulation models from your web or mobile app. Use a high-level modeling language embedded in JSON, and a simple REST API that’s free for small problems, but scalable to handle huge models. Frontline Systems Inc.Sponsor [New JavaScript Techniques for Rapid Page Loads](http://blog.chromium.org/2015/03/new-javascript-techniques-for-rapid.html) Chrome is introducing two techniques to optimize JS parsing and caching. Chromium Blog [The Destructuring Algorithm in ECMAScript 6](http://www.2ality.com/2015/03/destructuring-algorithm.html) Dr. Axel Rauschmayer [35 Talks and Keynotes from the ng-conf 2015 Conference](http://ng-conf.org/) A wide variety of talks to enjoy if Angular is your thing from both the core team and outside experts. ng-conf [Building a Mobile JavaScript Powered Audio Player](http://www.sitepoint.com/building-mobile-javascript-powered-audio-player/) Leans on numerous APIs, like the Ambient Light API, Proximity API, Battery Status API, and Vibration API. SitePoint [Best Practices and Components with React: An Online Event](http://www.oreilly.com/pub/e/3378) Next Thursday (26th) there's a free 90 minute online event with two React talks from Brian Holt and Ben Anderson. O'Reilly Media Jobs - [Opening for Front End Developer @ Queue Software (Raleigh, NC)](http://queuesoftware.com/frontend?utm_source=javascriptweekly&utm_medium=email)Queue is developing a tool that allows users to easily build and deploy custom native iOS and Android apps. We need an in-house Javascript expert excited to help us build and maintain our breakthrough web app. Queue Software - [Frontend Engineer (Full-Stack)](http://jobs.babbel.com/en/?utm_source=javascriptweekly&utm_medium=email)With up to 120,000 downloads per day and more than 8,000 hours of language learning content, Babbel the market leading online-learning app, is looking for a Frontend Engineer (Full-Stack). Your mission will be to support our Marketing Team to optimize the technical infrastructure. Babbel (Lesson Nine GmbH) - [Freelance with Companies like Airbnb, IDEO JPMorgan](http://www.toptal.com/developers?utm_source=js_weekly&utm_medium=cpm-newsletter&utm_campaign=js_weekly_job)Work on special projects with great companies through Toptal. Set your weekly/hourly rate, and work from anywhere in the world as an elite HTML5 developer. See if you have what it takes TopTal In Brief [The ES6 Spec, Release Candidate 3](http://wiki.ecmascript.org/doku.php?id=harmony:specification_drafts#march_17_2015_rev_36_release_candidate_3) news ECMA [New e-book: React+d3.js: How to Build Data Visualizations with React and d3.js](http://swizec.com/reactd3js/) news A (paid) e-book, screencast, etc. Swizec Teller ['You Don't Know JavaScript' Workshop Online](https://frontendmasters.com/workshops/using-all-of-javascript/) course A full day of intermediate/advanced JS covering topics such as coercion and client/server JS. [Join in LIVE April 3rd.](https://frontendmasters.com/workshops/using-all-of-javascript/) Frontend MastersSponsor [Building a Pacman Game With Bacon.js](http://www.sitepoint.com/building-pacman-with-bacon-js/) tutorial SitePoint [Using Dependency Injection in Your JavaScript Unit Tests with Rewire](https://strongloop.com/strongblog/javascript-unit-testing-using-dependency-injection/) tutorial StrongLoop [Understanding ECMAScript 6: Class and Inheritance](http://www.sitepoint.com/understanding-ecmascript-6-class-inheritance/) tutorial SitePoint [Understanding Collisions and Physics with Babylon.js and Oimo.js](http://www.sitepoint.com/understanding-collisions-physics-babylon-js-oimo-js/) tutorial SitePoint [A Quick Intro to Azure DocumentDB's Server-Side JavaScript](http://channel9.msdn.com/Blogs/Windows-Azure/Azure-Demo-A-Quick-Intro-to-Azure-DocumentDBs-Server-Side-Javascript) video node Channel 9 [Defensive JavaScript? Yes, Please!](http://blog.javascripting.com/2015/03/18/defensive-javascript/) opinion Tomas Weiss [About The JS1k 2015 Competition](http://www.michalpaszkiewicz.co.uk/about-js1k2015.html) opinion Includes a few cute tricks to save characters when coding tight. Michal Paszkiewicz [The Spy in the Sandbox: Practical Cache Attacks in JavaScript](http://arxiv.org/abs/1502.07373#) An academic paper presenting ‘the first micro-architectural side-channel attack which runs entirely in the browser’. Oren, Kemerlis et al. [24% of database devs don’t use source control. Do you?](http://www.red-gate.com/products/sql-development/sql-source-control/?utm_source=javascriptweekly&utm_medium=displayemail&utm_content=24_percent&utm_campaign=sqlsourcecontrol&utm_term=email-23340) tools Database source control is now standard. SQL Source Control is an easy way to start – it links your database to any source control system. Try it free. Red Gate SoftwareSponsor [payform: Library for Building Credit Card Forms + Validating and Formatting](http://jondavidjohn.github.io/payform/) code A fork of Stripe’s jQuery.payment plugin built to be consumed on more platforms with no jQuery requirement. Jonathan Johnson [MuJS: An Embeddable JavaScript Interpreter Written in C](http://mujs.com/) code Artifex Software [jsGrid: A Lightweight Grid jQuery Plugin](http://js-grid.com/) code Artem Tabalin [Textures.js: SVG Patterns for Data Visualization](http://riccardoscalco.github.io/textures/) code [is.js: A Helper Library for 'Checking' Things](http://arasatasaygin.github.io/is.js/) code A well presented library of helper functions that ‘check’ data or types.. is something a number? Is a date on the weekend? Is something an array? There’s a lot here and it’s well documented too. arasatasaygin Curated by [Peter Cooper](http://twitter.com/peterc) and published by [Cooperpress](https://cooperpress.com/). Like this? 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