2017-06-10 11:09 GMT+02:00 Stephen Reay <php-li...@koalephant.com>:
>
> > On 10 Jun 2017, at 15:19, Björn Larsson <bjorn.x.lars...@telia.com>
> wrote:
> >
> > Den 2017-06-09 kl. 22:00, skrev Niklas Keller:
> >> 2017-06-09 15:44 GMT+02:00 Sara Golemon <poll...@php.net>:
> >>
> >>> On Fri, Jun 9, 2017 at 7:23 AM, Björn Larsson <
> bjorn.x.lars...@telia.com>
> >>> wrote:
> >>>> If I take the liberty in using the example above on our option list:
> >>>> 1. $someDict->map(fn($v) => $v * 2)->filter(fn($v) => $v % 3);
> >>>> 2. $someDict->map(function($v) => $v * 2)->filter(function($v) => $v %
> >>> 3);
> >>>> 3. $someDict->map($v ==> $v * 2)->filter($v ==> $v % 3);
> >>>> 4. $someDict->map(($v) => $v * 2)->filter(($v) => $v % 3); //
> >>>> Ambiguous
> >>>> 5. $someDict->map([]($v) => $v * 2)->filter([]($v) => $v % 3);
> >>>>
> >>>> Old proposals:
> >>>> 6. $someDict->map($v ~> $v * 2)->filter($v ~> $v % 3);
> >>>> 7. $someDict->map(lambda($v) => $v * 2)->filter(lambda($v) => $v % 3);
> >>>>
> >>> Something else which really pops in these examples is the effect of
> >>> not needing to use parentheses when embedding a single-arg short
> >>> lambda. 3 and 6 in your list read cleaner to me (due to the lack of
> >>> parenthesis clutter). Sadly ~> has the same hacky implementation
> >>> issues as ==>, but I think that shows a little bit of why the HackLang
> >>> team decided the messy lexer was worth the clearer syntax.
> >>
> >> Another possible syntax (dunno whether this has already been suggested
> >> on-list):
> >>
> >> $function = { $x => 2 * $x };
> >> $function = { ($x) => 2 * $x };
> >> $function = | $x => 2 * $x |;
> >> $function = | ($x) => 2 * $x |;
> >>
> >> Nikita and Levi prefer it with parenthesis, I prefer it without,
> because I
> >> think it's unnecessary clutter.
> >>
> >> A reason to use | ... | instead of { ... } would be to allow future
> object
> >> literals.
> >>
> > Applying that to Sara's example becomes:
> > 8. $someDict->map({$v => $v * 2})->filter({$v => $v % 3});
> > 9. $someDict->map(|$v => $v * 2|)->filter(|$v => $v % 3|);
> >
> > I also find that parenthesis makes it cluttered.
> > $someDict->map({($v) => $v * 2})->filter({($v) => $v % 3});
> >
> > Cheers //Björn
> >
> >
> > --
> > PHP Internals - PHP Runtime Development Mailing List
> > To unsubscribe, visit: http://www.php.net/unsub.php
>
> I find it quite odd that people are claiming paren’s around 0 arguments is
> ‘clutter’, but curly braces or pipes around the entire thing is somehow not
> clutter. While I understand there are small differences like implicit
> return and automatic capturing, having such wildly different syntax to a
> regular still doesn’t make much sense to me.
The difference is that `{ ... }` or `| ... |` is required to be
unambiguous, otherwise it conflicts with other parser rules.
Regards, Niklas
