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Understanding JavaScript Promises, Pt. I: Background & Basics. Free Course Build Your First Node.js Website Node is a powerful tool to get JavaScript on the server. Use Node to build a great website. # The Promised Land Native Promises are amongst the biggest changes ES2015 make to the JavaScript landscape. Promises feature a fairly simple API, but come with a bit of a learning curve. By the end of this article, you'll be able to: Articulate why we have promises, and what problems they solve;Explain what promises are, from the perspective both of their implementation and their usage; andReimplement common callback patterns using promises.

Oh, one note. Just clone it down and checkout the Part_1 branch: git clone git checkout Part_1-Basics . . . The Problem with CallbacksPromises: Definitions w/ Notes from the A+ SpecPromises & Un-inversion of ControlControl Flow with Promises Grokking then, reject, & resolve # Asynchronicity Sync & Async Synchronous code runs before any code that follows it. The Challenge of Asynchronicity. Learn ES2015 · Babel. Es6features This document was originally taken from Luke Hoban's excellent es6features repo. Go give it a star on GitHub! REPL Be sure to try these features out in the online REPL. Introduction ECMAScript 2015 is an ECMAScript standard that was ratified in June 2015. ES2015 is a significant update to the language, and the first major update to the language since ES5 was standardized in 2009. See the ES2015 standard for full specification of the ECMAScript 2015 language. ECMAScript 2015 Features Arrows and Lexical This Arrows are a function shorthand using the => syntax.

Classes ES2015 classes are a simple sugar over the prototype-based OO pattern. Class SkinnedMesh extends THREE.Mesh { constructor(geometry, materials) { super(geometry, materials); this.idMatrix = SkinnedMesh.defaultMatrix(); this.bones = []; this.boneMatrices = []; //... } update(camera) { //... super.update(); } static defaultMatrix() { return new THREE.Matrix4(); }} Enhanced Object Literals Template Strings Destructuring.

Babel · The compiler for writing next generation JavaScript. Object-Oriented JavaScript — A Deep Dive into ES6 Classes. Often we need to represent an idea or concept in our programs — maybe a car engine, a computer file, a router, or a temperature reading. Representing these concepts directly in code comes in two parts: data to represent the state, and functions to represent the behavior. ES6 classes give us a convenient syntax for defining the state and behavior of objects that will represent our concepts. ES6 classes make our code safer by guaranteeing that an initialization function will be called, and they make it easier to define a fixed set of functions that operate on that data and maintain valid state.

If you can think of something as a separate entity, it’s likely you should define a class to represent that “thing” in your program. Consider this non-class code. How many errors can you find? The date today isn’t valid: there’s no month 24. Here’s the corrected version that uses classes. class SimpleDate { constructor(year, month, day) { this. Constructors Keep Data Private Privacy with Conventions.

Top 10 ES6 Features Every Busy JavaScript Developer Must Know. I recently went to HTML5 Dev conference in San Francisco. Half of the talks I went to were about ES6 or, as it’s now called officially, ECMAScript2015. I prefer the more succinct ES6 though. This essay will give you a quick introduction to ES6. If you don’t know what is ES6, it’s a new JavaScript implementation. If you’re a busy JavaScript software engineer (and who is not?) , then proceed reading to learn the best 10 features of the new generation of the most popular programming language—JavaScript.

Here’s the list of the top 10 best ES6 features for a busy software engineer (in no particular order): Default Parameters in ES6Template Literals in ES6Multi-line Strings in ES6Destructuring Assignment in ES6Enhanced Object Literals in ES6Arrow Functions in ES6Promises in ES6Block-Scoped Constructs Let and ConstClasses in ES6Modules in ES6 Disclaimer: the list if highly biased and subjective.

[Sidenote] Go check out Node University which has FREE videos courses on Node: node.university. 1. 2. 3. Build your first ES2015/ES6 application. GitHub - EscuelaIt/Curso-ECMAScript-6: Repositorio del Curso ECMAScript 6. What is PhantomJS and How is it Used? PhantomJS is a headless WebKit scriptable with a JavaScript API. It has fast and native support for various web standards: DOM handling, CSS selector, JSON, Canvas, and SVG.

The above definition may be ambiguous, in simple terms, PhantomJS is a web browser without a graphical user interface. In simple terms, PhantomJS is a web browser without a graphical user interface This then begs the question, What use is a browser without a GUI? A web browser without a graphical user interface is pretty much useless. . # Installing PhantomJS Before we learn more about PhantomJS, first you need to install it on your computer. After downloading the binary, you need to add the executable to PATH environment variable. . # PhantomJS Core Concepts Since PhantomJS is not usable when it comes to surfing the web, it has a whole set of features that developers love and use for many purposes.

Screen capturePage automationNetwork monitoringTestingAnd more... Screen Capture phantomjs screenshot.js Page Automation Testing. JavaScript for Line of Business Applications. How to Use ES6 for Universal JavaScript Apps — JavaScript Scene. The ES6 love is in the `env` and `ecmaFeatures` keys. You’ll need those to prevent errors when ESLint encounters your ES6-specific code. If you also want object rest & spread (an ES7 proposal commonly used in React code), you’ll also need `babel-eslint`. Compiling For most cases, you can simply replace your `node` calls with `babel-node` calls. `babel-node` caches modules in memory, so there’s a significant startup delay and potentially a lot of memory usage. Babel’s docs make compiling look like a breeze: $ babel script.js --out-file script-compiled.js Couldn’t be easier, right?

$ babel -d build-dir source-dir Note that the output directory comes first. If you want the debugger to work properly, you will want to add source maps with the `-s` option: $ babel -d build-dir source-dir -s To compile for the browser, you want to use Webpack, or the Babelify Browserify transform. Npm install -g browserify browser-runbrowserify -t babelify script.js | browser-run -p 2222 Compile a bundle: Automation. Firebase + riot + es6.

Guía paso a paso para crear una Isomorphic app con React, Express y ES6. Seguramente te estarás preguntando qué será eso de Isomorphic app. Dicho término no es más que un concepto que describe que el código JavaScript que normalmente ejecutamos en el cliente (Browser) también puede correr en el servidor (Node). Por ejemplo, nuestros componentes de React también pueden ser renderizados en el Backend. Esto abre un abanico de posibilidades que podrás ya estar evidenciando, y de las que muy probablemente trataremos a lo largo de este tutorial. Últimamente suele hablarse mucho acerca de cómo las Single Page Applications(SPA) contribuyen al mejoramiento de la interacción con el usuario; en comparación a como se venía haciendo con el desarrollo tradicional de una app. Pero no debemos olvidar que el mayor problema de una SPA, es su relación con el SEO.

Esto es debido a que los rastreadores del buscador no indexan bien el JavaScript; que es básicamente de lo que éstas se conforman. Para seguir el tutorial paso a paso, implementaremos una metodología Git.