Re: [Chicken-users] Parsing HTML, best practice with Chicken

[Mario Domenech Goulart]

Hi,

On Mon, 29 Dec 2014 12:12:22 +0100 Kooda <address@hidden> wrote:

>> ;; --- member? returns #t if elemnt x is in list lst.
>> ;; --- ref:
>> ;; --- 
>> http://stackoverflow.com/questions/14668616/scheme-fold-map-and-filter-functions
>> ;; --- use: (member? "a" (list "a" 1)) --> #t
>> (define (member? x lst)
>>   (fold (lambda (e r)
>>           (or r (equal? e x)))
>>         #f lst))
>
> This function already exists, it’s called `member` and is in the
> srfi-1 library.

It's actually in the Scheme specification:
http://www.schemers.org/Documents/Standards/R5RS/HTML/r5rs-Z-H-9.html#%_idx_432

`member' from SRFI-1 provides an extension to allow the equality
procedure to be passed in as an extra argument.

Best wishes.
Mario
-- 
http://parenteses.org/mario