HTML, CSS, & JavaScript All-in-One For Dummies

Chapter 8

Manipulating Strings, Dates, and Numbers

IN THIS CHAPTER

Manipulating strings

Working with dates and times

Performing math calculations

All great programmers learn the same way. They poke the box. They code something and see what the computer does. They change it and see what the computer does. They repeat the process again and again until they figure out how the box works.

—SETH GODIN

Although your JavaScript code will spend much of its time dealing with web page knickknacks such as HTML tags and CSS properties, it will also perform lots of behind-the-scenes chores that require manipulating strings, dealing with dates and times, and performing mathematical calculations. To help you through these tasks, in this chapter you explore three of JavaScript’s built-in objects: the String object, the Date object, and the Math object. You investigate the most important properties of each object, master the most used methods, and encounter lots of useful examples along the way.

Manipulating Text with the String Object

I've used dozens of examples of strings so far in this book. These include not only string literals (such as "HTML, CSS, and JavaScript For Dummies") but also methods ...