Re: The shared variable problem

Hi!


Duncan Booth wrote:
> The problem:
>
> Any variable assigned to 'this' in the base class constructor becomes a 
> class variable in the subclasses: but is NOT shared between 
> different subclasses (if I further subclasses MyClass1 then subclasses of 
> MyClass1 would also share the same instance as MyClass1 itself).
>
> This probably isn't what we want, since if we want a class variable we 
> could create it by assigning to MyBase.prototype.bar.
>
> The solution, it seems to me, is that we need to ensure that the base class 
> constructor is called whenever an instance of a derived class is 
> constructed. Javascript won't do this automatically, but it is easy enough 
> to do it manually. (For anyone reading this who doesn't know Ecmascript 
> backwards: apply is a method of all functions which allows you to call the 
> function with an explicit 'this' value. If the function takes parameters 
> these are simply specified after the 'this' value.)

Recently I found this: http://www.webreference.com/js/column80/9.html

It seems to describe the same problem and to propose a very similar 
solution.


Cheers,

        Yuppie