Introducing JavaScript

JavaScript has changed a great deal since it was first introduced but many sites still use outdated techniques. There are even lots of JavaScript tutorials on the web that show you how JavaScript should be written so that it can work in Netscape 2 rather than so that it will work in modern browsers. As a result there are many people who are writing what they think is JavaScript but where what they are producing is more suited to the 20th Century than to the 21st.

Beginners should work through all the basic examples prior to moving on to the other examples which cover separate aspects of JavaScript in more detail.

Most of the JavaScript examples here will work in IE5+, Opera7+ and all versions of Firefox, Safari and Chrome. Those commands introduced in ECMAScript 5 in 2011 are being added to the site where they are supported by the latest version of all popular browsers. Where these new commands are not supported by IE8 or IE7 that information is included in the text since those two browsers might still have to many users for you to ignore. So few people using other browsers fail to keep their browser up to date that lack of support in older versions of other browsers will not have any significant affect.

A few examples of what we can expect from EcmaScript 6 are also included in their own section so you can see the direction that JavaScript is moving in - even though it will probably be quite a while before we can use those commands.

There is a link to jsBin at the bottom right of all the pages. This site provides an easy way to test your JavaScript code online without needing to create an entire web page to run a simple test.

Optional Arguments

Optional arguments will be much easier to define and use in the next version of JavaScript.

Block Scoping – const

Variables are not the only things that will be able to have block scope in JavaScript once the new version is introduced. You will also be able to define constants.

ECMAScript 6

The new standard for JavaScript is just about finished and will soon be finding its way into browsers. This new version introduces a number of new commands into JavaScript. We’ll look at some of these over the next few days so that you know what to expect from JavaScript in the future. One new feature […]

Deprecated jQuery

Just as with server side languages and unlike JavaScript itself, jQuery actually deprecates commands when better alternatives are introduced. The closest to this that JavaScript itself has got is via “use strict” where you choose to apply deprecation to JavaScript by adding that new command.

jQuery Utilities

Many of the jQuery utility methods have more recently had equivalent methods implemented directly in JavaScript – making these utilities far less useful.

This site is © copyright Stephen Chapman - Felgall Pty Ltd 2011-2015.

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You are welcome to use any the example JavaScript from this site in the scripts for your site or any that you develop for others but may not use the longer example scripts that contain a copyright notice in any other way without permission.