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JavaScript for Line of Business Applications

JavaScript for Line of Business Applications
Related:  JavascriptES6 app

7 Essential JavaScript Functions I remember the early days of JavaScript where you needed a simple function for just about everything because the browser vendors implemented features differently, and not just edge features, basic features, like addEventListener and attachEvent. Times have changed but there are still a few functions each developer should have in their arsenal, for performance for functional ease purposes. debounce The debounce function can be a game-changer when it comes to event-fueled performance. function debounce(func, wait, immediate) { var timeout; return function() { var context = this, args = arguments; var later = function() { timeout = null; if (! The debounce function will not allow a callback to be used more than once per given time frame. poll As I mentioned with the debounce function, sometimes you don't get to plug into an event to signify a desired state -- if the event doesn't exist, you need to check for your desired state at intervals: once getAbsoluteUrl isNative insertRule matchesSelector

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. ¿Existirá alguna alternativa para encontrar el equilibrio y brindar una excelente UX sin que nos afecte el posicionamiento? Para seguir el tutorial paso a paso, implementaremos una metodología Git. Para este ejemplo crearemos un Pokedex, el cual puedes ver en funcionamiento ya mismo aquí.

JavaScript Best Practices 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’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 Doing so will tell Babel that for each file it compiles, it should also produce a source map file that will tell debuggers where to find the original source code while you’re stepping through the live code in the engine. To compile for the browser, you want to use Webpack, or the Babelify Browserify transform. Compile a bundle:

20 JavaScript Frameworks Worth Checking Out The number of web applications being created and used has grown rapidly since the new millenium. And importantly, so has the sheer complexity of them -- specially on the front end. No more static pages, no sir! You have a ton of sections each interacting with each other and the server and yes, it's as complicated as it sounds and just as hard to pull off. Today, I'd like to talk about a few choice JavaScript frameworks that aim to simplify front-end application development. If you think jQuery is the answer, you lose a cookie and get an F grade! Creating responsive, fluid, and maintainable interfaces for web apps isn't as easy as one would imagine -- there is data to be sent back to the server and the results parsed, data stores to be updated, views to be re-rendered and so much else that needs to be done in the background. Sure, a few of these may be a little old but their code bases have lots of lessons to teach. Related links: Introduction to Sammy.js Github Repo Google Code

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. 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] Reading blog posts is good, but watching video courses is even better because they are more engaging. A lot of developers complained that there is a lack of affordable quality video material on Node. Go check out Node University which has FREE videos courses on Node:

The long road to Async/Await in JavaScript | Thomas Hunter II This is a comparison of different methods for performing asynchronous control flow in JavaScript, specifically Callbacks, Promises, Generators / Yields (ES6), and Async / Await (ES7). To follow along be sure you understand how the JavaScript Event Loop works and what it means when code is executed synchronously in the current stack, or shoved into the queue to be executed asynchronously in the future. In the following contrived examples, publishLevel() is our main application code (perhaps something we’d see in a Controller), whereas getUser(), canCreate(), and saveLevel() are functions nested deeper in our application (perhaps in our Models). Compatibility: Keep in mind that anything marked as ES6 will require Node.js >= 0.12 with the --harmony flag enabled, or any version of io.js >= 1.0. Browser support for ES6 is anything but spectacular and you’ll likely need to transpile. Anything marked as ES7 will definitely require a transpile for either Browser or Node.js. Stage 1: Callbacks

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. Consider this non-class code. 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. JARGON TIP:When a function is associated with a class or object, we call it a When an object is created from a class, that object is said to be an Constructors Keep Data Private Privacy with Conventions Privacy with Symbols

The Single Biggest Mistake Programmers Make Every Day — JavaScript Scene The Single Biggest Mistake Programmers Make Every Day I recently taught a master class at a conference. The first half of the day I stood in front of the class and talked about The Two Pillars of JavaScript: Prototypal OO and functional programming. For the second half, I had the students team up and collaborate on an app project. The assignment was to keep in mind a few key points from the lessons: Don’t export any classes. After beginning the practice assignment, I spent the rest of the day walking around the room and helping the teams progress. I got some great responses. And my personal favorite: Brendan Eich seemed to like it, too: I believe the single biggest mistake that every programmer makes from time to time is overcomplicating things. Keep it Stupid Simple There is a common design principle that (according to Wikipedia) originated in the US Navy: KISS — Keep It Simple, Stupid I don’t think that goes far enough, so I say “Keep It Stupid Simple”. What is Simple Code? One thing is simple.

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. 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 Object literals are extended to support setting the prototype at construction, shorthand for foo: foo assignments, defining methods and making super calls.