January 2013
Beginner to intermediate
116 pages
2h 15m
English
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Appendix A. JavaScript Basics
JavaScript is a versatile, lightweight, and easy-to-use scripting language. It is most often used in websites and web-based applications, although it is becoming increasingly common to find it used on the server side using a server-side implementation of JavaScript such as Node.js. Some desktop and mobile applications are even starting to use JavaScript and HTML5.
Due to the wide usage and huge popularity of JavaScript, many libraries have been written for it, a few of which include jQuery, YUI, Dojo, and MooTools. jQuery is currently the most popular, with 85% of the market share and thousands of contributors. Many major projects are built off jQuery, such as jQuery Mobile, Twitter Bootstrap, and jQuery UI.
It is also extremely fast—Apple and Google’s fight for the fastest JavaScript engine (Safari’s Nitro and Chrome’s V8 engine, respectively) has pushed the engineers at both companies to improve the speed of the engines to the point where micro-optimizations are almost entirely unnecessary.
JavaScript is a very forgiving language, and often developers can make mistakes without them having an effect on the site; browsing the Internet with the JavaScript console open often displays errors on many big websites. Unfortunately, this has the side effect of allowing the developers to make mistakes of which they are not made aware, and they develop bad habits that they may then pass on to other people. A lot of online tutorials, and often even books, contain ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.