[plt-scheme] lambda-apply-values

On 21/11/2008, at 23:07, Stephen De Gabrielle wrote:

> Hi,
>
> something I seem to often do is use list as structures, (and have  
> lists of these)
>
> eg
>
> #lang scheme
> (define  people '(("Guy" 40 man) ("Maddona" 50 woman)))
>
> I am often doing something like;
>
> (map (λ (person)
> (let ((name (car person))
>         (age (car person))
>         (gender (car person)))
>    (blah-fn name age gender)
>  ) people)

(map (match-lambda (((list name age gender) (blah-fn name age  
gender))) people)

or there-abouts.

Match is, imo, grand.

Per some of the other comments, I try not to use lists as structures  
per-se, but when pulling information out of XML files I find that  
that's just how it is, and match is just brilliant for turning them  
back into structs or function arguments.

Cheers,

Andrew