On Mon, Jun 7, 2021, at 2:00 PM, Larry Garfield wrote: > Hi folks. Me again. > > A year ago, I posted an RFC for a pipe operator, |>, aka function > concatenation. At the time, the main thrust of the feedback was "cool, > like, but we need partial function application first so that the syntax > for callables isn't so crappy." > > The PFA RFC is winding down now and is looking quite good, so it's time > to revisit pipes. > > https://wiki.php.net/rfc/pipe-operator-v2 > > Nothing radical has changed in the proposal since last year. I have > updated it against the latest master. I also updated the RFC to use > more examples that assume PFA, as the result is legit much nicer. i > also tested it locally with a combined partials-and-pipes branch to > make sure they play nicely together, and they do. (Yay!) Assuming PFA > passes I will include those tests in the pipes branch before this one > goes to a vote.
Hi again. With PFA being declined, I've again reworked the Pipes RFC. 1) It now does not use PFA in any examples, but it does use Nikita's first-class-callables RFC that looks like it's going to pass easily. 2) With major hand-holding from Levi Morrison and Joe Watkins, the implementation has shifted a bit. It now evaluates left-to-right, always, whereas the previous version evaluated right-to-left. That is, instead of $a |> $b |> $c desugaring into $c($b($a)), it now becomes effectively $tmp = $a; $tmp = $b($tmp); $tmp = $c($tmp); That matters if $b or $c are function calls that return a callable, as they are then only called when the pipeline gets to that part of the expression. (If all the functions involved are pure functions, then it doesn't make a difference in practice.) 3) I included references to several existing PHP libraries that implement similar logic, in mostly complex and ugly ways. 4) Of note, Brent posted a Twitter poll last week about pipes, and the response was overwhelmingly in favor. (https://twitter.com/brendt_gd/status/1408271132650885123) Naturally a Twitter poll is extremely unscientific, but I think between the existing libraries and the response there the answer to the question "is there actually a demand for this feature?" is unquestionably yes. 5) Examples have been reworked to be a bit prettier. 6) Added another language reference that has a pipe operator that works basically like described here. (OCaml) I am planning to take this version of the RFC to a vote on Monday or Tuesday, as Tuesday is the last day possible to start a vote for 8.1 features. --Larry Garfield -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: https://www.php.net/unsub.php
