Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
JavaScript In a "Gist" | Client-side web development

#JavaScript In a "Gist"

##Author

Fredrick Galoso - November 9, 2011

##License

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.

##Learning to programing with JavaScript

Web browsers are everywhere. Because of this, JavaScript is the choice for client-side web development and making to static HTML documents dynamic. "JavaScript In a 'Gist'" is an attempt to teach the basics of programming with an eye towards creating practical, usable, browser applications. It is designed as a gentle introduction to first time programmers or to the experienced developer, a resource for those looking to quickly add another language to their repertoire.

#First Steps

##Development environment JavaScript is most commonly added to HTML documents as either an embedded or external script.

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>Title</title>
    <script type="text/javascript">
        // Embedded JavaScript goes here
    </script>
</head>
<body>
    <!--External JavaScript file, located in the same folder as this HTML document-->
    <script src="main.js" type="text/javascript"></script>
</body>
</html>

However, for many of the examples covered in this book, JavaScript console will be the easiest way to follow along.

##Variables

Programming often involves keeping track of and modifying data. Variables make it easy to store data and operate on at a later time. In addition, data in JavaScript consists of different, dynamic types depending on the purpose.

  /* I am a block comment 
   * with multiple lines.
   */
  var name = 'Johnny Appleseed'; // This is an inline comment

This is a basic variable declaration. var indicates variable assignment, name is the variable name, and it is equal to the String value "Johnny Appleseed". All statements in JavaScript end with a ;. Comments // (inline) or /**/ (block) are useful documenting our code.

What other types of data can we declare as variables? Quite a few:

  var number = 1; // Number
  var precise = 1.2; // More precise Number
  var collection = []; // An empty Array
  var person = {}; // An empty Object
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.