On Fri, Jun 9, 2017 at 4:43 PM, Rowan Collins <rowan.coll...@gmail.com> wrote:
> On 9 June 2017 21:00:48 BST, Niklas Keller <m...@kelunik.com> wrote:
>>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.
>
> I already suggested the brace version, and Levi said it would conflict in the
> parser: https://externals.io/thread/911#email-15331 I don't know enough about
> parsing to comment on what workarounds would be possible.
It ends up not conflicting; when at top level you can keep existing
behavior and otherwise make it a closure. Given that creating a
closure without assigning it to variable or passing it to a function
is useless this is fine.
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