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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