Comments on: Object-Oriented JavaScript – Part I (Objects)

By: Eliza Hasas

Eliza Hasas — Fri, 05 Mar 2010 01:44:53 +0000

Hi, I found this blog article while searching for help with JavaScript. I have recently changed browsers from Chrome to Microsoft Internet Explorer 5. Just recently I seem to have a issue with loading JavaScript. Every time I browse page that requires Javascript, my browser doesn’t load and I get a “runtime error javascript.JSException: Unknown name”. I cannot seem to find out how to fix it. Any help is greatly appreciated! Thanks

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By: cancel bubble

cancel bubble — Thu, 08 Oct 2009 21:27:33 +0000

Think of the prototype object as the template upon which an object is based. Any properties/methods on that prototype are passed on to all instances of that class.

So in your example, if you ended up with 50 instances of Person, each instance of Person will have *it’s own copy* of the getName() method. That’s wasteful as you really only need one instance of that method (since it does the same thing for every instance).

Putting the getName() method on the prototype object, you only have one instance of that method, but it’s passed on to those 50 instances of Person. Much more efficient.

There’s an awesome book called “Pro JavaScript Design Patterns” by Ross Harmes and Dustin Diaz I highly recommend. It’s really a great look at Object Oriented JavaScript. You can pick up a used copy on Amazon for probably $20-25.

By: Shawn

Shawn — Thu, 08 Oct 2009 20:22:10 +0000

@Tony and @Shitic – Thanks for the kind words.

I’ll get more of this series out real soon guys, been a busy couple days here.