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What is an “unwrapped value” in Swift?
...so you see two "layers" ({{...}}), whereas in the third case, you see only one layer ({...}) because the object is being automatically unwrapped.
The difference between the first case and the second two cases is that the second two cases will give you a runtime error if optionalSquare is set to nil...
PHP: How to use array_filter() to filter array keys?
...ith keys shorter than 4 characters
$a = array(
0 => "val 0",
"one" => "val one",
"two" => "val two",
"three"=> "val three",
"four" => "val four",
"five" => "val five",
"6" => "val 6"
);
$f = array_filter(array_keys($a), function ($k){ return strle...
Cannot run Eclipse; JVM terminated. Exit code=13
...clipse and jdk but still trying to specify with x86.... At least i'm not alone xD
– AmazingDreams
Nov 3 '12 at 10:16
2
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libpng warning: iCCP: known incorrect sRGB profile
...ng seems to modify all files in the tree. I would prefer updating only the one faulty image.
– Uflex
Oct 8 '16 at 13:53
2
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Comments in Markdown
...(This is also a comment.)
To improve platform compatibility (and to save one keystroke) it is also possible to use # (which is a legitimate hyperlink target) instead of <>:
[//]: # (This may be the most platform independent comment)
For maximum portability it is important to insert a blan...
How do I find the MySQL my.cnf location
...f
Those are the default locations MySQL looks at. If it finds more than one, it will load each of them & values override each other (in the listed order, I think). Also, the --defaults-file parameter can override the whole thing, so... basically, it's a huge pain in the butt.
But thanks to ...
Why does Oracle 9i treat an empty string as NULL?
... As I understand the SQL specifications, ' ' is not the same as NULL -- one is a valid datum, and the other is indicating the absence of that same information.
...
When should I use Struct vs. OpenStruct?
... hand, must have its attributes defined when you create it. The choice of one over the other should be based primarily on whether you need to be able to add attributes later.
The way to think about them is as the middle ground of the spectrum between Hashes on one side and classes on the other. ...
Test if a property is available on a dynamic variable
... it has over Try/Catch is solely when the exception is thrown. So what someone should ask before using reflection here - is it likely to be a certain way? 90% or even 75% of the time, will your code pass? Then Try/Catch is still optimal. If its up in the air, or too many choices for one to be most l...
Unix tail equivalent command in Windows Powershell
... for tail, not tail -f and an efficient implementation as well. Since this one also reads the complete file before returning the last lines this is painful for the file sizes they expect.
– Joey
Dec 13 '10 at 9:26
...