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.

Date

To obtain the current date and time as a text string without having to create a Date object you can simply call the Date function.

Boolean

As well as a number of built in objects, JavaScript also has a few built in functions. Some of these functions have the same names as some of the built in objects – the difference is that you call the functions directly rather than specifying the ‘new’ keyword. The simplest function is Boolean which takes […]

Console

While not (yet) a part of the standards, all popular browsers support using this object to write messages to the console. No more do you need to insert dialogs into your code that will interrupt execution in order to provide easy ways to check what values variables contain and which path the processing is following.

Function

The Function object is the base on which all of the functions in your code are built. While you can create functions directly using this object there are far better ways of doing so as you have already seen in earlier examples. Where this object does come in useful is that it provides a place […]

JSON

The JSON object is the second of the static objects provided in JavaScript. It provides just two methods – one for converting an object into a text string and the other to convert a text string definition of an object back into that object. Note that some older browsers do not implement this object and […]

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