This week's JavaScript news, issue 235

Code smells, essential JS functions, var vs let vs const, and why Babel matters Read this e-mail on the Web JavaScript Weekly Issue 235 — June 5, 2015 JavaScript Code Smells A great 30 minute talk by Elijah Manor showing off a variety of code smells (a symptom in source code of other underlying problems) and possible resolutions for them. Elijah Manor 7 Essential JavaScript Functions Short, useful functions aimed at front-end developers to do things like match a selector, get an absolute URL, or prevent a callback from being called multiple times within a certain timeframe. David Walsh De Stijl: How Necessary Are var, let, and const? ES6 lets us use three different explicit variable declaration techniques: var, let and const. Reg digs into their use and sees when they can replace one another. Reg Braithwaite How to find and fix the slowest code in your .NET application Boost the performance of your .NET application with ANTS Performance Profiler. Get rich performance data on your code and database queries to find your application's bottleneck fast. Try ANTS Performance Profiler on your application now. Red Gate Software   Sponsored Why Babel Matters Babel mostly transpiles ES6 code into ES5 code that can run in today’s browsers, but also performs other optimizations. This post includes a compelling example of why it’s such a big deal. Charles Pick Predictions On JavaScript in The Next 12 Months Jack sees pre-compilation becoming the default, the rise of libraries over frameworks, the popularity of ES7, and more. Jack Franklin Making Music in the Browser with the Web MIDI API Enabled in the latest Chrome, the Web MIDI API is here to play with. Here’s a quick look at how to do that from JavaScript. Keith McMillen Instruments A Tour of Node.js Tools for Visual Studio A chat about Visual Studio’s recently improved Node.js support followed by a practical dive into creating a deploying an Express app using VS. (40 minutes.) Channel 9 Jobs Apply to the best NYC & SF startups in 60 seconds with Underdog.ioWe handpick top startups; they connect directly with you. Join now to find a job you’ll love. Underdog JavaScript Developer at comScore (Amsterdam, The Netherlands)comScore is looking for like-minded developers who are keen to solve interesting UI related problems while working on developing new features and improving their in-house ‘Digital Analytix’ product. comScore Top JavaScript Freelancers Wanted (Telecommute)We only hire the absolute top-tier JavaScript developers and if you survive our utlra-screening™ process, the projects overfloweth. (Must read, write & speak English extremely well.) Toptal In brief JSON API 1.0 Declared Stable news A specification for APIs that use JSON.   Dan Gebhardt Power Surge: An HTML5 Game Optimization Challenge from Firefox news  Mozilla Hacks ES6 In Depth: Destructuring tutorial  Mozilla Hacks Easy AngularJS Forms with angular-formly tutorial  Ryan Chenkie ES7 Function Bind Syntax tutorial  Jeremy Fairbank Using Polymer WebComponents with Angular.js tutorial  Josh Crowther Detecting Unminifiable Angular Code tutorial  Marius Schulz Introduction to ES6 Promises: 4 Functions You Need To Avoid Callback Hell tutorial  James K Nelson An Introduction to Ember.js video A complete 90 minute live coding exercise.   Jamie White Setting State in React video A short video demoing setting state in React -- part of the new course with Ryan Florence.  Frontend Masters   Sponsored Is ReactJS Really Fast? opinion  Boris Dinkevich WatchBench: Build Apple Watch Apps in JavaScript tools Seemingly a US only iOS app for now.   Alpha Software Know JavaScript? Build Mobile Apps Using Your Web Skills. tools AppBuilder combines the tools you need to build, test & deploy mobile apps to iOS, Android and Windows Phone.  Telerik   Sponsored J2C: JavaScript to CSS Compiler tools code A CSS preprocessor based around JavaScript objects; provides a subset of Sass.   Pierre-Yves Gérardy 15 Directives to Extend Your Angular.js Apps tools  CodeCondo JSpreadsheets: A Listing of 31 Open-Source JS Spreadsheets and Data Grids tools  Handsoncode Knwl.js: A JavaScript Natural Language Parser code Parse text for dates, times, places, phone numbers, and more.   LoadFive Vectorious: Generalized n-Dimensional Matrix & Vector Library code tutorial  Mateo Gianolio pdfmake: Client/Server Side PDF Generation/Printing in Pure JS code Based on PDFKit.   Bartek Pampuch SlackBots.js: A Node Library for Running a Slack Bot code node  Mikhail Mokrushin Hammer.JS: Add Touch Gestures to Your Pages code Has no dependencies and can recognize gestures made by touch, mouse and pointerEvents.   Eight Media irecord: An Immutable Store That Exposes An RxJS Observable code A Backbone model with a twist: an immutable object map that exposes an RxJS observable. Good for React.   Eric Elliott EON: Open Source JavaScript Framework for Realtime Dashboards/Maps code  PubNub console.message: Console Messages for 'Cool Kids' code Essentially a bunch of extensions to ‘console’ to print more elaborate messages.   Antonio Stoilkov Curated by Peter Cooper and published by Cooper Press. Stop getting JavaScript Weekly : Change email address : Read this issue on the Web © Cooper Press Ltd. Office 30, Lincoln Way, Louth, LN11 0LS, UK

by via JavaScript Weekly