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Alpha Radiation - JavaScript

Think JavaScript is only good for image swaps and flying <div>s?Think again - this article takes an in-depth look at some of theobject-oriented constructs available in JavaScript, and demonstrates howJavaScript objects can substantially speed up code development anddeployment.

  1. An Object Lesson In JavaScript
  2. Object Lessons
  3. Sumthing New
  4. Alpha Radiation
  5. Add()ing Some More
  6. Turning Up The Heat
  7. Room With A View
  8. Construction Crew
  9. A Hot Date
By: Vikram Vaswani, (c) Melonfire
Rating: starstarstarstarstar / 23
April 02, 2001

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So far, Sumthing's just sitting around looking pretty - it doesn't actually do anything yet. Let's fix that by modifying it to accept some arguments.
<script language="JavaScript">
// object constructor
function Sumthing(num1, num2) {
// object properties
this.alpha = num1;
this.beta = num2;

The object Sumthing now has two properties, "alpha" and "beta". With this, it is possible to create an instance of the object Sumthing, and pass it two parameters ("num1" and "num2"), which are then stored as object properties ("alpha" and "beta"). Note my use of the "this" keyword, which provides a convenient way to access variables (and functions) which are "local" to the object constructor.

Let's take it for a spin.
<script language="JavaScript">
obj = new Sumthing(2, 89);
alert("alpha is " + obj.alpha);
alert("beta is " + obj.beta);

And you should see something like this:

>>> More JavaScript Articles          >>> More By Vikram Vaswani, (c) Melonfire

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