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How to convert list of key-value tuples into dictionary?
... of "good practice" is entirely context-dependent; do you need O(1) lookup time for keys? Also you cannot "convert lists to dictionaries" arbitrarily; it entirely depends on the semantics. e.g. [(1,2), (1,3)] -> {1:3} would clobber your keys and lose info! A dict is a one-to-* relation with O(1) ...
Can I get git to tell me all the files one user has modified?
I would like git to give me a list of all the files modified by one user, across all commits.
4 Answers
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Can I catch multiple Java exceptions in the same catch clause?
... exceptions it is either exceptionA or exceptionB but not both at the same time. this is why they used XOR sing instead of OR and you can see that clearly when the exception is throws if you put 2 exceptions one of them is sub type of another
– user1512999
Mar ...
Copy array items into another array
..., IE: slower (concat = winner), Firefox: slow (push.apply = winner, yet 10 times slower than Chrome's concat) ... speak of bad JS engine implementation.
– Bitterblue
Jun 10 '16 at 9:25
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quick random row selection in Postgres
...w COUNT..." ... If your data is so small, that you can count in reasonable time, go for it! :-)
– alfonx
Dec 15 '19 at 10:11
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Uncatchable ChuckNorrisException
... maybe you could compile code which throws ChuckNorrisException, but at runtime provide a class definition of ChuckNorrisException which does not extend Throwable.
UPDATE:
It doesn't work. It generates a verifier error:
Exception in thread "main" java.lang.VerifyError: (class: TestThrow, method: ...
Is there a “null coalescing” operator in JavaScript?
Is there a null coalescing operator in Javascript?
13 Answers
13
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Create singleton using GCD's dispatch_once in Objective-C
...t];
useinside = NO;
});
// returns the same object each time
return _sharedObject;
}
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How to show a dialog to confirm that the user wishes to exit an Android Activity?
...s can happen if your main activity can be added to the back stack multiple times, or if you are manipulating your back stack history.
if(isTaskRoot()) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Are you sure you want to exit?")
.setCancelable(...
How to detect READ_COMMITTED_SNAPSHOT is enabled?
In MS SQL Server is there a way to detect whether a database has had its isolation level set via the T-SQL command ALTER DATABASE <database> SET READ_COMMITTED_SNAPSHOT ON;
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