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Kotlin Ternary Conditional Operator
... can use instead of the ternary operator expression a ? b : c.
I think the idea is that the former expression is more readable since everybody knows what ifelse does, whereas ? : is rather unclear if you're not familiar with the syntax already.
Nevertheless, I have to admit that I often miss the mor...
Does it make sense to use “as” instead of a cast even if there is no null check? [closed]
...archy, which for value types involves boxing anyway. Of course, the entire idea is more theoretical than serious.
– Mehrdad Afshari
Nov 28 '12 at 7:13
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How to find the size of an array in postgresql
...luates to null and not 0 whereas cardinality returns what you'd expect. No idea what they were thinking with that logic.
– EoghanM
Oct 13 '18 at 10:25
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How to test Spring Data repositories?
...m Repository), the test fails and userRepository.findOne returns null. Any ideas of how to solve this?
– Rega
Aug 10 '19 at 20:31
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Checking from shell script if a directory contains files
...; ((${#f}))
This trick is 100% bash and invokes (spawns) a sub-shell. The idea is from Bruno De Fraine and improved by teambob's comment.
files=$(shopt -s nullglob dotglob; echo your/dir/*)
if (( ${#files} ))
then
echo "contains files"
else
echo "empty (or does not exist or is a file)"
fi
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How do I convert this list of dictionaries to a csv file?
... are a little different, but way simpler and less error prone. It's a good idea to tell the CSV your file should be opened with utf8 encoding, as it makes that data more portable to others (assuming you aren't using a more restrictive encoding, like latin1)
import csv
toCSV = [{'name':'bob','age':2...
string.Join on a List or other type
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I stole the idea from Python if that is any help!
– Deleted
Aug 31 '10 at 19:47
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How does the static modifier affect this code?
...tances.
read more
Hope this helps!
If you feel like some trivia, this idea was first introduced by Plato
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How do I design a class in Python?
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The whole idea of OO design is to make your code map to your problem, so when, for example, you want the first footstep of a dog, you do something like:
dog.footstep(0)
Now, it may be that for your case you need to read in your raw ...
Unique Key constraints for multiple columns in Entity Framework
... the best one but it requires some time to do it. I will just show you the idea behind it:
In this link http://code.msdn.microsoft.com/CSASPNETUniqueConstraintInE-d357224a
you can find the code for unique key data annotation:
[UniqueKey] // Unique Key
public int FirstColumn { get; set;}
[Uni...