As we learn more and more JavaScript, we can build increasingly complex applications. In the previous lesson, we added long-term memory to our JavaScripts using cookies. Now we’ll add a sense of time to our growing stock of JavaScript knowledge.

In the previous lesson, we looked at the many different things you can do with text and strings. Today we’ll focus on two different types of data:images and objects. By the end of this lesson, you’ll know how to:

• Use image maps with JavaScript
• Preload images to speed up your image swaps
• Create your own objects to make big scripts comprehensible
• Use associative arrays to rapidly access all the objects in your scripts

We’ll get the ball rolling with image maps.

Wow – you made it to the last and final lesson! Stunning. As a reward for all your hard work, I’ve made this lesson extremely relaxing – no nitty-gritty code to wrap your mind around and no hairy homework, just coding theory and pointers to resources.

The topics for the day are:

• Tools to help you write JavaScript
• Debugging techniques
• Tips for making your JavaScript code run quickly