Re: Update of pcase docs for the elisp manual

[Michael Heerdegen]

Eli Zaretskii <address@hidden> writes:

> I understand.  I'm just saying that it would be better to provide an
> example of using 'let' which actually made use of the reason for its
> introduction: binding symbols to values.

It's not easy to find an example for a usage of the let pattern that is
not too complicated and can't be replaced trivially with other patterns,
and does also make at least a bit of sense.

I maybe would suggest something like this:

--8<---------------cut here---------------start------------->8---
(pcase some-list
  ((and (let value (calculate-some-value))
        (or (pred (member  value))
            (pred (assoc   value))))
   value))
--8<---------------cut here---------------end--------------->8---

This tests some-list whether - for a VALUE calculated and bound in a let
pattern, whether either this VALUE is a member of the argument list, or
a key in it interpreted as an alist.  If it is, that value is returned.


How is the state of the documentation now?  Do you need some more
contributions, or should I proofread everything?


Regards,

Michael.