From: Matt Wette <matt.wette@gmail.com>
To: Matt Wette <matt.wette@gmail.com>
Cc: Guile User <guile-user@gnu.org>
Subject: Re: Anaphoric macros like when-let
Date: Sat, 26 Aug 2017 12:54:31 -0700 [thread overview]
Message-ID: <4FFD033C-26F5-417A-AEE2-9D0A434AE484@gmail.com> (raw)
In-Reply-To: <12D2B2C2-41A5-4F66-98DB-7F7A5AF0C819@gmail.com>
> On Aug 26, 2017, at 12:50 PM, Matt Wette <matt.wette@gmail.com> wrote:
>
>
>> On Aug 26, 2017, at 12:47 PM, Arun Isaac <arunisaac@systemreboot.net> wrote:
>>
>>
>> Is there a Scheme or Guile equivalent to Emacs Lisp's `when-let' ?
>>
>> Basically, I'm looking for a shorthand to express this:
>>
>> (let ((x (foo))
>> (when x
>> (bar x))))
>>
>> as this:
>>
>> (when-let (x (foo))
>> (bar x))
>>
>
> (use-modules (srfi srfi-2))
>
> (and-let* ((x foo))
> (bar x))
(and-let* ((x (foo)))
(bar x))
next prev parent reply other threads:[~2017-08-26 19:54 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-26 19:47 Anaphoric macros like when-let Arun Isaac
2017-08-26 19:50 ` Matt Wette
2017-08-26 19:54 ` Matt Wette [this message]
2017-08-27 12:28 ` Arun Isaac
2017-08-26 22:40 ` Kyle Siehl
2017-08-27 20:24 ` Mark H Weaver
2017-08-28 9:41 ` Arun Isaac
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.gnu.org/software/guile/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4FFD033C-26F5-417A-AEE2-9D0A434AE484@gmail.com \
--to=matt.wette@gmail.com \
--cc=guile-user@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).