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Date: Fri, 7 Feb 2025 17:51:45 +0100
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Subject: Re: [PHP-DEV] [RFC] Pipe Operator (again)
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To: Larry Garfield <larry@garfieldtech.com>,
 php internals <internals@lists.php.net>
References: <de8140ab-0941-45cd-ba20-4aece2f69aea@app.fastmail.com>
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From: cmbecker69@gmx.de ("Christoph M. Becker")

On 07.02.2025 at 05:57, Larry Garfield wrote:

> Hi folks.  A few years ago I posted an RFC for a pipe operator, as seen =
in many other languages.  At the time it didn't pass, in no small part bec=
ause the implementation was a bit shaky and it was right before freeze.  N=
onetheless, there are now even more (bad) user-space implementations in th=
e wild, as it gets brought up frequently in "what do you want in PHP?" thr=
eads (though nowhere near generics or better async, of course), so it seem=
s clear there is demand in the market for it.
>
> It is now back with a better implementation (many thanks to Ilija for hi=
s help and guidance in that), and it's nowhere close to freeze, so here we=
 go again:
>
> https://wiki.php.net/rfc/pipe-operator-v3

Thank you!  I very much appreciate the simplicity (and efficiency) of
the implementation.

> Of particular note, since the last RFC I have concluded that a compose o=
perator is a necessary complement to a pipe operator.  However, it's also =
going to be notably more work, and the two operators don't actually intera=
ct at all at the code level, so since people keep saying "Small RFCs!", he=
re's a small RFC. :-)

Fair enough.  And with the pipe operator, one might live without a
compose operator, e.g.

  $f1 =3D fn($x) =3D> 2 * $x;
  $f2 =3D fn($x) =3D> $x + 3;
  // $f3 =3D $f2 =E2=88=98 $f1
  $f3 =3D fn($x) =3D> $x |> $f1 |> $f2;

Christoph