Re: pcase without code duplication

[michael-franzese@gmx.com]

Can one also use nil as option in pcase.  What possibilities
exist for (_ ?

e.g.

(nil
((or 0 nil)
((or _ nil)  

Regards
Michael


> Sent: Friday, April 23, 2021 at 3:24 PM
> From: "Óscar Fuentes" <ofv@wanadoo.es>
> To: help-gnu-emacs@gnu.org
> Subject: Re: pcase without code duplication
>
> michael-franzese@gmx.com writes:
> 
> > I am using pcase, but am wondering whether I can have pcase
> > for 0 and 2 do the same things without adding a separate pcase
> > (0 and duplicating the statements.
> >
> > (pcase orthogr-region
> >   (0 ... )    ; same operations as pcase 2
> >   (1 ... )
> >   (2 ... )    ; operations
> >   (_ ... ) )
> 
> (let ((xx 2))
>   (pcase xx
>     (1 (message "one"))
>     ((or 0 2) (message "zero or two"))
>     (_ (message "something else"))))
> 
> 
>