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Date: Tue, 3 May 2016 12:53:27 +1000
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To: Stephen Coakley <me@stephencoakley.com>
Cc: internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=047d7b10ca0968d3c10531e738cb
Subject: Re: [PHP-DEV] [RFC] Pipe Operator
From: terry@terah.com.au (Terry Cullen)

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On 3 May 2016 at 10:57, Stephen Coakley <me@stephencoakley.com> wrote:

> On 04/30/2016 06:14 PM, Rowan Collins wrote:
>
>> On 29/04/2016 20:58, Sara Golemon wrote:
>> Let's say I want to add a condition just before getFileArg(); with the
>> current version I've got to:
>> - go to the beginning of the chain, and assign to something other than
>> $ret
>> - go to where I want to break the chain, and reintroduce the $ret
>> assignment
>> - add my check in the gap, using the variable I just added at the
>> beginning of the chain
>>
>> $fileList =3D scandir($arg)
>>      |> array_filter($$, function($x) { return $x !=3D=3D '.' && $x !=3D=
 '..';
>> })
>>      |> array_map(function ($x) use ($arg) { return $arg . '/' . $x; },
>> $$);
>> if ( someCheck($fileList) {
>>      something();
>> }
>> $ret =3D getFileArg($$)
>>      |> array_merge($ret, $$);
>>
>> The syntax is fighting me here, making me jump around the code. But if
>> assignment was always on the end of the chain, I would only need to make
>> changes at the point where I was breaking the chain. The basic pattern
>> would be:
>>
>> |=3D> $tempVar; // terminate the chain and capture the value
>> // do stuff with $tempVar
>> $tempVar // restart the chain
>>
>> So:
>>
>> scandir($arg)
>>      |> array_filter($$, function($x) { return $x !=3D=3D '.' && $x !=3D=
 '..';
>> })
>>      |> array_map(function ($x) use ($arg) { return $arg . '/' . $x; },
>> $$)
>>      |=3D> $fileList;
>> if ( someCheck($fileList) {
>>      something();
>> }
>> $fileList
>>      |> getFileArg($$)
>>      |> array_merge($ret, $$)
>>      |=3D> $ret;
>>
>> If I don't need the condition any more, I can delete lines 4 to 8, and
>> I've got back my original chain.
>>
>
> Could you use a closure instead to accomplish this? (Again yes, Sara coul=
d
> you clarify if this is permitted?)
>
> $ret =3D scandir($arg)
>         |> array_filter($$, function($x) { return $x !=3D=3D '.' && $x !=
=3D
> '..'; })
>         |> array_map(function ($x) use ($arg) { return $arg . '/' . $x; }=
,
> $$)
>         |> (function($fileList) {
>                if (someCheck($fileList)) {
>                    something();
>                }
>                return $fileList;
>            })($$)
>         |> getFileArg($$)
>         |> array_merge($ret, $$);
>
> Not completely the best, but perhaps there's some sort of an idea here?
>
>
> --
> Stephen
>
> --
> PHP Internals - PHP Runtime Development Mailing List
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>
>

=E2=80=8BDoesn't Nikic's scalar objects (https://github.com/nikic/scalar_ob=
jects)
more or less achieve the same thing while also cleaning up the std lib?

$ret =3D scandir($arg)
    ->filter(function(){})
    ->map(function(){})
    ->merge($someOtherArray);

Terry Cullen

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