[plt-scheme] Something like $_ in Perl

Eduardo Cavazos wrote:

> In these situations, I admire and miss the $_ variable in Perl. It
> would be nice if the value of <test> in a cond were bound to some
> variable in the <expression> portion, such as $_ for example.

Have you noticed =>  ?

As in

  (cond ((assv 'b '((a 1) (b 2))) => cadr)
        (else #f))

which evaluates to 2.

Se section 4.2.1 in R5RS:

<http://www.schemers.org/Documents/Standards/R5RS/HTML/r5rs-Z-H-7.html#%_sec
_4.2.1>


--
Jens Axel Søgaard