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Should a retrieval method return 'null' or throw an exception when it can't produce the return value
... In Java 8, returning Optional<T> (called Maybe<T>, etc. in other languages) is an option as well. This clearly indicates to the caller that returning nothing is a possibility, and won't compile if the caller hasn't handled that possibility, as opposed to null, which (in Java ...
Checking whether a variable is an integer or not [duplicate]
...? So, for example, before I give data to a database query when wanting to fetch an objetc by id, which is an integer, I check if input is actually and integer and useable before handing it to the database layer.
– Henning
Jun 15 '13 at 9:49
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Enforcing the type of the indexed members of a Typescript object?
...cases with typeof Number (e.g. Infinity, NaN, 1e300, 999999999999999999999 etc) get converted to string keys. Also beware of other corner cases for string keys like x[''] = 'empty string';, x['000'] = 'threezeros'; x[undefined] = 'foo'.
– robocat
Feb 4 '19 at 2...
Remove Identity from a column in a table
...pt the table to be created; rename everything e.g. 'MyTable2', 'MyIndex2', etc.
Remove the IDENTITY specification.
You should now have two "identical"-ish tables, one full, the other empty with no IDENTITY.
Run ALTER TABLE [Original] SWITCH TO [Original2]
Now your original table will be empty and th...
DateTime.Now vs. DateTime.UtcNow
...one they live in.
We also display relative times (2 hours ago, 1 day ago, etc) until the post ages enough that the time is "the same" no matter where on Earth you live.
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Mysql - How to quit/exit from stored procedure
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As of MySQL v5.5 you can throw an exception. Negating exception handlers, etc. that will achieve the same result, but in a cleaner, more poignant manner.
Here's how:
DECLARE CUSTOM_EXCEPTION CONDITION FOR SQLSTATE '45000';
IF <Some Error Condition> THEN
SIGNAL CUSTOM_EXC...
Initialising mock objects - MockIto
...You declare the variable, and give it a value - no annotations, reflection etc.
– Karu
Jun 2 '15 at 4:14
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Algorithm for Determining Tic Tac Toe Game Over
...for an n by n board with n in a row to win (3x3 board requries 3 in a row, etc)
edit: added code to check anti diag, I couldn't figure out a non loop way to determine if the point was on the anti diag so thats why that step is missing
public class TripleT {
enum State{Blank, X, O};
int n...
When is the finalize() method called in Java?
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In general it's best not to rely on finalize() to do any cleaning up etc.
According to the Javadoc (which it would be worth reading), it is:
Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
As Joachim pointe...
How do I reattach to a detached mosh session?
... example. I lose connection (laptop battery dies, lose network connection, etc.). I connect again via mosh and get that message on the server,
Mosh: You have a detached Mosh session on this server (mosh [XXXX]).
All I have to do is kill the prior mosh session
kill XXXX
and reattach to th...