Sams Teach Yourself JavaScript in 24 Hours

Hour 5. Using Variables, Strings, and Arrays

What You'll Learn in This Hour: Naming and declaring variables Choosing whether to use local or global variables Assigning values to variables How to convert between different data types Using variables and literals in expressions How strings are stored in String objects Creating and using String objects Creating and using arrays of numbers and strings

Welcome to the beginning of Part II of this book. Now that you have learned some of the fundamentals of JavaScript and the DOM, it's time to dig into more details of the JavaScript language.

In this hour, you'll learn three tools for storing data in JavaScript: variables, which store numbers or text; strings, which are special variables for working with text; and arrays, which are multiple variables you can refer to by number.