--- title: "This week's JavaScript news, issue 249" publication: "JavaScript Weekly" issue: 249 published_at: "2015-09-11" canonical_url: "https://javascriptweekly.com/issues/249" --- This week's JavaScript news, issue 249 This week's JavaScript news — [Read this e-mail on the Web](http://javascriptweekly.com/issues/249) JavaScript WeeklyIssue 249 — September 11, 2015[How Burke Holland Came To Love TypeScript](http://developer.telerik.com/featured/how-i-came-to-love-typescript/) Explains how he overcame his initial skepticism and learned to love the benefits of strong typing. Burke Holland [Node v4.0.0 (Stable) Released](https://nodejs.org/en/blog/release/v4.0.0/) The first stable release bringing the best of Node and io.js together. It uses the same version of V8 shipping with Chrome which brings [a variety of ES6 features](http://www.cli-nerd.com/2015/09/09/7-reasons-to-upgrade-to-node-v4-now.html) to Node as standard. Node.js [Lessons Backbone Developers Can Learn From React](http://benmccormick.org/2015/09/09/what-can-backbone-developers-learn-from-react/) The big ideas are that interfaces should be a tree of composable components, modern JavaScript leads to cleaner code (great ES5 vs ES6 vs ES7 example), and not using DOM as a source of state. Ben McCormick [![HackReactor\](https://copm.s3.amazonaws.com/43ef081b.png)](http://www.hackreactor.com/blog/partnerships-with-lenders-pave-affirm-make-financing-hack-reactor-more-accessible-to-students/?utm_source=coopermedia_sept2015&utm_medium=js_primary&utm_campaign=lendingpartners)[Partnerships with Lenders Makes Hack Reactor More Accessible to Students](http://www.hackreactor.com/blog/partnerships-with-lenders-pave-affirm-make-financing-hack-reactor-more-accessible-to-students/?utm_source=coopermedia_sept2015&utm_medium=js_primary&utm_campaign=lendingpartners)Apply today for our renowned coding school and you'll find financing your education easier than ever before. New lending partnerships give students the ability to access loans and improve their careers without money standing in the way - [Learn more](http://www.hackreactor.com/blog/partnerships-with-lenders-pave-affirm-make-financing-hack-reactor-more-accessible-to-students/?utm_source=coopermedia_sept2015=js_primary=lendingpartners) HackReactorSponsor [ES6 for Now: Template Strings](http://www.sitepoint.com/es6-now-template-strings/) A look at the benefits ES6’ template strings bring, such as multi-line support and string expressions/interpolation. Christian Heilmann [Building A Prototype JavaScript Engine for MongoDB](http://thecalvinchan.com/blog/2015/09/05/faster-than-v8/) An in-depth look at work done by two MongoDB interns to significantly improve the performance of Mongo’s $where operator. Calvin Chan [The Names of Functions in ES6](http://www.2ality.com/2015/09/function-names-es6.html) A look at the various ways in which functions acquire their formal names. Dr. Axel Rauschmayer [The Best of ES6 JavaScript](https://www.youtube.com/watch?v=AfWYO8t7ed4) A 13 minute video covering a variety of useful ES6 features live. Great if video works better for you than articles. YouTube [Promises in JavaScript Unit Tests: A Definitive Guide](http://www.sitepoint.com/promises-in-javascript-unit-tests-the-definitive-guide/) Promises are becoming increasingly popular in JavaScript code, but how do you deal with them in unit tests? Jani shares some techniques when using Mocha and Chai. Jani Hartikainen Jobs - [Senior JavaScript Developer at Shore (Munich, Germany: relocation covered)](https://boards.greenhouse.io/shoregmbh/jobs/97893#.VfLctRHtlBc?utm_source=javascriptweekly&utm_medium=email)Shore is looking for passionate developers who breathe JavaScript. Join a startup write production-ready ECMAScript 2015 in an agile environment. `Promise.resolve('challenge').then((c) => You.accept(c).at(Shore))` Shore GmbH - [JavaScript Engineer at Storefront (San Francsico, CA)](https://angel.co/storefront/jobs/77450-senior-software-engineer?utm_source=javascriptweekly&utm_medium=email)Storefront is looking for talented JavaScript engineers to help build the future of retail. Want to solve hard problems and build a world-class marketplace for tomorrow's commercial real estate rentals? We're growing fast, apply today through AngelList! Storefront - [JavaScript Developer at Backbase (Amsterdam)](http://www.jobscore.com/jobs2/backbase/lead-frontend-developer/aD_iK8ROWr45y7eJe9fLhG?ref=rss&sid=68)If you love to build beautiful user experiences, if you want to breathe Javascript daily, if you look for multicultural teams and inspiring city - join Backbase and have fun with us in Amsterdam! Check out what we do: [Working at Backbase](https://www.youtube.com/watch?v=OI3XGVK7dYQ) Backbase In Brief [ng-conf May 4th - 6th 2016 - The World's Original Angular Conference](http://www.ng-conf.org/#ticketlottery) news They're offering the opportunity to buy a ticket via a [ticket lottery](https://ti.to/ng-conf/2016/) this year. [React v0.14 Release Candidate](http://facebook.github.io/react/blog/2015/09/10/react-v0.14-rc1.html) news Facebook [The State of Front-End Tooling – 2015](http://ashleynolan.co.uk/blog/frontend-tooling-survey-2015-results) news Ashley Nolan [IBM Acquires StrongLoop; And What This Means for the Node.js Community](https://strongloop.com/strongblog/node-js-community-ibm-acquisition/) news StrongLoop [You Know How to Code, but How Are Your Design Skills?](http://trydesignlab.com/a/web-design-course/ad49af1e/?utm_source=jsweekly&utm_medium=email&utm_campaign=september2015) course Learn UI UX design through part-time, online courses with 1-on-1 mentorship from expert designers. DesignlabSponsor [How Do JavaScript Closures Work Under The Hood](http://dmitryfrank.com/articles/js_closures) tutorial Complete with diagrams. Dmitry Frank [Preloading Images in Parallel with Promises](http://www.sitepoint.com/preloading-images-in-parallel-with-promises/) tutorial Hugo Giraudel [Making A Full Screen Bootstrap Carousel with Random Initial Image](http://www.sitepoint.com/full-screen-bootstrap-carousel-random-initial-image/) tutorial George Martsoukos [Typed Arrays in ECMAScript 6](http://www.2ality.com/2015/09/typed-arrays.html) tutorial Typed arrays introduce a more efficient way to handle data of known type and size in JavaScript. Axel digs deep into their usage. Dr. Axel Rauschmayer [The Problem with Securing Single Page Apps](https://stormpath.com/blog/secure-single-page-app-problem/?utm_source=javascript-weekly&utm_medium=newsletter&utm_campaign=problem-with-spa-blog) tutorial Single Page and mobile webapps present a unique set of security “challenges”. Let’s talk about out how to avoid the XSS, MitM, CSRF, and authentication pitfalls. StormpathSponsor [ES6 Symbols in Depth](http://ponyfoo.com/articles/es6-symbols-in-depth) tutorial Nicolas Bevacqua [An iOS Developer on React Native](https://medium.com/@chalkchisel/an-ios-developer-on-react-native-1f24786c29f0) opinion Chalk + Chisel [Angular Material vs. Material Design Lite](https://scotch.io/bar-talk/angular-material-vs-material-design-lite) opinion Jad Joubran [MockTheClock: A Tiny JS Library to Spoof Timers and Other Time Functions](https://github.com/zb3/MockTheClock) code zb3 [stupidbox: Extremely Simplistic jQuery Image Lightbox Plugin](https://github.com/starikovs/stupidbox) code Vacheslav Starikov [Angular 2 RXJS Chat Example](https://github.com/ng-book/angular2-rxjs-chat) code A simple chat application built using Angular 2, RxJS, Webpack, TypeScript, and more. ng-book [Jets.js: Search Functionality Implemented via CSS](http://nexts.github.io/Jets.js/) code Denis Lukov [Vulcan: A JavaScript Automated Proof System](http://rmarcus.info/blog/2015/09/02/vulcan.html) code Ryan Marcus Curated by [Peter Cooper](http://twitter.com/peterc) and published by [Cooperpress](https://cooperpress.com/). 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