[plt-scheme] hash-table question

Well that was embarrassing. 

 Apparently I have more dead brain cells than I ever imagined.  

Thanks to all for the help.


On Fri, 4 Feb 2005 07:43:55 -0800 (PST), Noel Welsh <noelwelsh at yahoo.com> wrote:
> 
> --- Larry White <ljw1001 at gmail.com> wrote:
> 
> >   For list-related administrative tasks:
> >   http://list.cs.brown.edu/mailman/listinfo/plt-scheme
> >
> > is there a way to get at the values of a hash-table as a
> > list?
> 
> You might find the recipes in the Cookbook handy:
> 
>    http://schemecookbook.org/Cookbook/HashChapter#Hashes
> 
> You could use, e.g. (untested):
> 
>   (define (hash-table->values-list table)
>     (hash-table-map table
>       (lambda (key value)
>         value)))
> 
> > Since the hash-table-for-each and hash-table-map
> > functions require a
> > proc with exactly two procedures (key and value), they're
> > not really
> > useful for my situation.  I need to apply a four
> > parameter function to each value.
> 
> This makes me think you don't fully grasp the power of
> closures.   Maybe this will help:
> 
>   http://schemecookbook.org/Cookbook/IdiomStaticVariables
> 
> (Amazingly, there is nothing on currying in the cookbook!)
> 
> HTH,
> Noel
> 
> =====
> Email: noelwelsh <at> yahoo <dot> com
> AIM: noelhwelsh
> 
> 
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