Prestwood IT: JavaScript Variables (var x = 0;) (JavaScript and AJAX)

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JavaScript Beginners Corner:

JavaScript Variables (var x = 0;)

By Mike Prestwood

Posted 16 years ago on 11/7/2008 and updated 1/16/2009

JavaScript Code Snippet:

To/From Code Guide: JavaScript Variables... vs. Other Languages

A flashcard from our JavaScript Flashcards Library

A code snippet from our JavaScript Code Snippets Page

Tags: JavaScript , Variables

KB101566

Languages Focus: Variables

A variable holds a value that you can use and change throughout your code so long as the variable is within scope. With variable declaration, you not only want to know the syntax of how you declare a variable but you also want to know where. Are you allowed to declare a variable inline? What are the available scopes: local vs. global. Can you assign a value at the same time you declare a variable?

JavaScript Variables

JavaScript is a loosely typed language. Each variable is cast in usage as string, number, boolean, function, or object.

Variable names are case sensitive.

Alternatively, you can specify the value when you declare a variable:

var FirstName = "Mike";

var LastName = "Prestwood";

var Age = 42;

Syntax Example:

var FirstName;

var LastName;

var Age;

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Code Contributed By Mike Prestwood:

Mike Prestwood is a drummer, an author, and creator of the PrestwoodBoards online community. He is the President & CEO of Prestwood IT Solutions. Prestwood IT provides Coding, Website, and Computer Tech services. Mike has authored 6 computer books and over 1,200 articles. As a drummer, he maintains play-drums.com and has authored 3 drum books. If you have a project you wish to discuss with Mike, you can send him a private message through his PrestwoodBoards home page or call him 9AM to 4PM PST at 916-726-5675 x205.

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