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What does “default” mean after a class' function declaration?
I've seen default used next to function declarations in a class. What does it do?
5 Answers
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How can I get the diff between all the commits that occurred between two dates with Git?
...g: Log for 'master' only goes back to Tue, 16 Mar 2010 14:17:32 +0100. and does not show all diffs.
git format-patch --since=yesterday --stdout does not give anything for me.
revs=$(git log --pretty="format:%H" --since="1 day ago");git diff $(echo "$revs"|tail -n1) $(echo "$revs"|head -n1) works so...
Why does scanf() need “%lf” for doubles, when printf() is okay with just “%f”?
...se then your code always works, whereas using %lf may fail if the compiler does not have a C99 compliant library. Unfortunately that situation does happen in reality.
– M.M
May 22 '16 at 4:39
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Why does ConcurrentHashMap prevent null keys and values?
...entHashMap fully compatible/interchangeable to Hashtable. And as Hashtable does not allow null keys and values..
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How does Haskell printf work?
...e classes. In the case of printf, the key is the PrintfType type class. It does not expose any methods, but the important part is in the types anyway.
class PrintfType r
printf :: PrintfType r => String -> r
So printf has an overloaded return type. In the trivial case, we have no extra argu...
Difference between modes a, a+, w, w+, and r+ in built-in open function?
...e file.
``w+'' Open for reading and writing. The file is created if it does not
exist, otherwise it is truncated. The stream is positioned at
the beginning of the file.
``a'' Open for writing. The file is created if it does not exist. The
stream is positioned at...
Reliable way for a Bash script to get the full path to itself [duplicate]
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This does not work if the script is in a directory from the $PATH and you call it bash scriptname. In such a case $0 does not contain any path, just scriptname.
– pabouk
Jun 15 '15 at 10:40
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What does bundle exec rake mean?
What does bundle exec rake db:migrate mean? Or just bundle exec rake <command> in general?
7 Answers
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ReactJS - Does render get called any time “setState” is called?
Does React re-render all components and sub components every time setState() is called?
7 Answers
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Add a column to a table, if it does not already exist
...r construct as OP posted but yes, if you want to take action if the column doesn't exist, the statement would be IF NOT EXISTS. I don't really feel the need to edit the answer for this but do feel free to edit yourself if you think it's an improvement.
– Lieven Keersmaekers
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