Re: [Jscheme-user] Minor nuisance/inconsistency

[Timothy H. <tim...@ma...>]

On Friday, March 7, 2003, at 11:20 AM, Robert J. Bobrow wrote:

> Folks,
> I  would expect that (cadr x) and (car (cdr x)) would behave 
> identically in all circumstances. Yet I find that car and cdr behave 
> like Common Lisp and return '() when given '() as an argument (I like 
> this, personnaly) and cadr throws an exception when handed '();
>
> I think the inconsistency is annoying -- I really prefer not to have 
> (car (cdr x)) in my code.
I've fixed that inconsistency, cadr and caddr were treated differently 
from all other cadadars

I have however kept that behavior for second and third.
So (second '(a)) --> error
       (cadr '(a)) --> ()
Perhaps it would be better to have second and third adhere to the same 
semantics of cadr and caddr,
but in a way it makes sense for second/third to give errors if the lists 
are too short....
I'd also like to add third, fourth, fifth, .... up to tenth or so....

What do you think?
---Tim---