Classes

[rarebit]

Hi, just trying a few variations, but for some reason the first output of the following gives two 'undefined', any reason why, I thought you could have two (or more) constructors like this?

 

<script type="text/javascript">
/*
4.
*/
function myclass()
{
this.a = 'Hello';
this.b = 'World';
}

function myclass(a,b)
{
this.a = a;
this.b = b;
}
var c = new myclass();
document.write('4a. '+c.a+' '+c.b+'!<br>');

var c = new myclass('World','Hello');
document.write('4b. '+c.a+' '+c.b+'!<br>');
</script>

[Mchl]

JavaScript does not support overloading of classes AFAIK.

[rarebit]

In my tests i'd be inclined to agree with you. This is a quote from here:

 

http://www.developertutorials.com/tutorials/javascript/writing-classes-in-javascript-050404/page1.html

Definition of a class - Definition of a class in JavaScript is done by just defining a no-parameter constructor. you can have constructors taking parameters but one constructor which doesn't take any parameter is mandatory. The name of the class is the name of the constructor.

 

oh well, no matter...

[Mchl]

The wording is somewhat strange...

 

Probably what they mean, is that class is defined by constructor, so you must define a constructor even if it takes no parameters...

 

Weird way to put it...