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JavaScript web apps considered valuable · molily. Recalling best practices for web applications that make heavy use of client-side JavaScript. It seems to me that the JavaScript community is stuck in a time warp. We’re having the same discussions about JavaScript-driven web applications we already had in 2006, when “Ajax” appeared, and in 2012, when JavaScript “single-page apps” became popular. It’s great to continue discussions as long as we stand on the shoulders of giants and try to improve what is already the best practice.

A recent rant by Stefan Tilkov is called “Why I hate your Single Page App”. More JavaScript web apps, less single-page apps First of all, I think the term “single-page application” is a perpetual source of misconception that finally leads to weak criticism of the concept. A [JavaScript web application] is a web site with a complex interface that provides a high level of interactivity. Passing on existing best practices The big JavaScript frameworks embrace these best practices as of today. Tilkov writes:


Frameworks / libs. Isomorphic JavaScript: The Future of Web Apps. By Spike Brehm This post has been cross-posted on VentureBeat. At Airbnb, we’ve learned a lot over the past few years while building rich web experiences. We dove into the single-page app world in 2011 with our mobile web site, and have since launched Wish Lists and our newly-redesigned search page, among others.

Each of these is a large JavaScript app, meaning that the bulk of the code runs in the browser in order to support a more modern, interactive experience. This approach is commonplace today, and libraries like Backbone.js, Ember.js, and Angular.js have made it easier for developers to build these rich JavaScript apps. JavaScript Grows Up Since the dawn of the Web, the browsing experience has worked like this: a web browser would request a particular page (say, “ causing a server somewhere on the Internet to generate an HTML page and send it back over the wire. The Single-Page App Trouble in Paradise Performance Maintainability A Hybrid Approach Routing. Deploying JavaScript Applications - Alex Sexton. Preface: Nothing in this post is necessarily new, or even anything I thought of first (save for a name or two). However, I’m writing it because I’d like to start building some consistency and naming conventions around a few of the techniques that I am using (and are becoming more common), as well as document some processes that I find helpful.

Much of this comes from my experience deploying applications at Bazaarvoice as a large third party vendor, and should probably be tailored to your specific environment. I’m sure someone does the opposite of me in each step of this with good results. Also, I fully understand the irony of loading a few MBs of GIFs in a post largely about performance, but I like them. Any specific tools I mention are because I’m familiar with them, not necessarily because there are no good alternatives. You You work on a large app. Dev with builds in mind Loading what you need is better than byte shaving Don’t penalize modern users One less jpeg Requests matter CSS Files. Learn JavaScript: — JavaScript Scene. There are so many JavaScript resources available out there, it’s hard to understand how much of it overlaps and how much is redundant.

Not to mention the process of weeding out bad information. Most JavaScript learning resources neglect two of the most important topics in JavaScript: prototypal inheritance and functional programming. There are many possible paths, several good paths, but few great paths. Here is one clear path to JavaScript mastery: JavaScript is the standard language of the web platform.

Learning it will allow you to build any app you want for any device or platform you want. Watch this 1 minute video to learn more about what JavaScript can do for you: The essentials, in order: Newbie friendly: Make a Star Wars Game with Hour of Code (free website)Newbie friendly: “JavaScript for Cats”, Max Ogden (free website)Newbie friendly: FreeCodeCamp’s Basic JavaScript track You can come back to FCC for more practice while you explore the rest of these resources. On ES6 Extra credit: Closure Tools. What is the Closure Compiler? The Closure Compiler is a tool for making JavaScript download and run faster. Instead of compiling from a source language to machine code, it compiles from JavaScript to better JavaScript. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls.

How can I use the Closure Compiler? You can use the Closure Compiler as: An open source Java application that you can run from the command line. To get started with the compiler, see "How do I start" below. What are the benefits of using Closure Compiler? Efficiency. Lazy Loading Asyncronous Javascript – Friendly Bit. Like many of you might know, I’m working on a site called Kundo with a couple of friends. It’s kinda like a Swedish version of Getsatisfaction, which means we have a javascript snippet that people add to their site to get feedback functionality. Cut-and-paste instead of writing the code yourself. Simple. The problem is, how do you load an external javascript with minimal impact on your customer’s sites? Here are my requirements: Small. Note: I did not make all of this up myself. Script tag While being the stand-alone, cross-browser, and the shortest piece of code possible; it doesn’t download asynchronously and doesn’t lazy load.

Screenshot from Firebug’s net console: The script (set to load in 2 seconds) blocks the download of the big image (added after the above script tag, and used throughout this article as a test). Async pattern (A script tag written with javascript) This is a pattern that is getting more and more popular nowadays, especially since Google Analytics uses it. JavaScript and the Netflix User Interface. Web Development Alex Liu, Netflix In the two decades since its introduction, JavaScript has become the de facto official language of the Web. JavaScript trumps every other language when it comes to the number of runtime environments in the wild. Nearly every consumer hardware device on the market today supports the language in some way.

While this is done most commonly through the integration of a Web browser application, many devices now also support Web views natively as part of the operating system UI (user interface). Despite its humble beginnings as a language intended to be Java's "silly little brother,"4 JavaScript eventually became a key component in enabling the Web 2.0 evolution.

With increasingly more application logic being shifted to the browser, developers have begun to push the boundaries of what JavaScript was originally intended for. A/B Testing Netflix is steeped in a culture of A/B testing. Facets to Features to Modules Dependency Management n! Looking Forward. ECMAScript 5 compatibility table. YouTube Player API Reference for iframe Embeds - YouTube. The IFrame player API lets you embed a YouTube video player on your website and control the player using JavaScript. Using the API's JavaScript functions, you can queue videos for playback; play, pause, or stop those videos; adjust the player volume; or retrieve information about the video being played. You can also add event listeners that will execute in response to certain player events, such as a player state change. This guide explains how to use the IFrame API. It identifies the different types of events that the API can send and explains how to write event listeners to respond to those events.

It also details the different JavaScript functions that you can call to control the video player as well as the player parameters you can use to further customize the player. Requirements The user's browser must support the HTML5 postMessage feature. Embedded players must have a viewport that is at least 200px by 200px. Getting started Loading a video player Operations Functions Queueing functions.


Learn. Font. Build. Test. Other libs. OO. Module. Writing Fast JavaScript For Games & Interactive Applications - Game Programming. Recent versions of JavaScript engines are designed to execute large bodies of code very fast but if you don't know how JavaScript engines work internally you could easily degrade your application's performance. It's specially true for games that need every drop of performance they can get. In this article I will try to explain some common optimization methods for JavaScript code that I picked up during development of my projects. One of the biggest problems in having a smooth experience resides in JavaScript garbage collector(GC) pauses.

In JavaScript you create objects but you don't release them explicitly. That's job of the garbage collector. The problem arises when GC decides to clean up your objects: execution is paused, GC decides which objects are no longer needed and then releases them. Zig-zag memory usage pattern while playing a JavaScript game. To keep your framerate consistent, you should keep garbage creation as low as possible. R.length = 0; Deleting Object Properties. JavaScript. JavaScript is classified as a prototype-based scripting language with dynamic typing and first-class functions.

This mix of features makes it a multi-paradigm language, supporting object-oriented,[6] imperative, and functional[1][7] programming styles. JavaScript has been standardized in the ECMAScript language specification. History[edit] Beginnings at Netscape[edit] JavaScript was originally developed by Brendan Eich, while working for Netscape Communications Corporation. Although it was developed under the name Mocha, the language was officially called LiveScript when it first shipped in beta releases of Netscape Navigator 2.0 in September 1995, but it was renamed JavaScript[10] when it was deployed in the Netscape browser version 2.0B3.[11] The change of name from LiveScript to JavaScript roughly coincided with Netscape adding support for Java technology in its Netscape Navigator web browser. Server-side JavaScript[edit] Adoption by Microsoft[edit] Standardization[edit] Trademark[edit] JavaScript Tutorial.

Zeros in JavaScript.


Jquery. Requirejs. Mvc. Nodejs.