On 3 May 2016 at 10:57, Stephen Coakley <m...@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
>>
>> $fileList = scandir($arg)
>> |> array_filter($$, function($x) { return $x !== '.' && $x != '..';
>> })
>> |> array_map(function ($x) use ($arg) { return $arg . '/' . $x; },
>> $$);
>> if ( someCheck($fileList) {
>> something();
>> }
>> $ret = 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:
>>
>> |=> $tempVar; // terminate the chain and capture the value
>> // do stuff with $tempVar
>> $tempVar // restart the chain
>>
>> So:
>>
>> scandir($arg)
>> |> array_filter($$, function($x) { return $x !== '.' && $x != '..';
>> })
>> |> array_map(function ($x) use ($arg) { return $arg . '/' . $x; },
>> $$)
>> |=> $fileList;
>> if ( someCheck($fileList) {
>> something();
>> }
>> $fileList
>> |> getFileArg($$)
>> |> array_merge($ret, $$)
>> |=> $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 could
> you clarify if this is permitted?)
>
> $ret = scandir($arg)
> |> array_filter($$, function($x) { return $x !== '.' && $x !=
> '..'; })
> |> array_map(function ($x) use ($arg) { return $arg . '/' . $x; },
> $$)
> |> (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
>
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>
>
Doesn't Nikic's scalar objects (https://github.com/nikic/scalar_objects)
more or less achieve the same thing while also cleaning up the std lib?
$ret = scandir($arg)
->filter(function(){})
->map(function(){})
->merge($someOtherArray);
Terry Cullen
