Re: Sort a list of dotted pairs

On Wed, 23 Jul 2008, Pascal J. Bourguignon wrote:

> BastiL2001@[EMAIL PROTECTED]
 writes:
> 
> > Dear group,
> >
> > I have a list of dotted pairs that may look something like this:
> > ((4 . something) (2 . maybe ) (3 . this ) (7 . last ) (5 . some))
> >
> > I want it to be sorted after the car of each dotted pair starting with
> > the lowest number...
> >
> > ((2 . maybe) (3 . this) (4 . something) (5 . some) (7 . last))
> >
> > Only thing I have done so far is the sort function which does not seem
> > to help in that case... How could this be done? Thanks.
> 
> It depends on how you made this sort function.
> If you made it like Common Lisp sort, then you can just write:
> 
>      (sort a-list < 'key car)
> 
> But if you made it like the sort we usually find in scheme libraries,
> then  you will have to write:
> 

Not really:

(sort a-list function-which-compares-cars)