From: Daniel Schierbeck <daniel.schierbeck@...>
Date: 2005-09-12T03:31:32+09:00
Subject: Re: Array#[]=

James Edward Gray II wrote:
> On Sep 11, 2005, at 1:01 PM, Daniel Schierbeck wrote:
> 
>> I'm writing a class representing a coordinate system, and I want to  
>> be able to give a point in the system a value (eg. a label). The  
>> problem is that the system can have a variable number of  dimensions. 
>> If it just had three, I could write:
>>
>>   def []= (x, y, z, value); end
>>
>> But this being an N-dimensional coordinate system, I have to come  up 
>> with something else. The most logical solution to me is this:
>>
>>   def[]= (*coordinates, value); end
>>
>> But this gives a syntax error. Am I way off base, or would it be  
>> useful if variable length argument lists could be written this way?
> 
> 
> If the slurpy arrays could be used anywhere in the list, if becomes  
> impossible to parse the arguments correctly.
> 
> In this case, you'll need to separate the value yourself:
> 
> def []=( *args )
>     value        = args.pop
>     cooridinates = args
>     # ...
> end
> 
> Hope that helps.
> 
> James Edward Gray II
> 
> 
> 

Thanks! That looks a lot better.


Daniel