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Sorting an array of objects by property values
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One issue I have with this is that with reverse=false, it will sort numbers as 1,2,3,4... but Strings as z,y,x...
– Abby
Apr 26 '12 at 13:42
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How can I combine two HashMap objects containing the same types?
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If you get a NPE, then apparently you did not initialize one of your objects properly. Do you print the stacktrace in the catch block? So you know where the problem arises. But unless you post the full and exact code including the stack trace you will need to track that down on you...
Does MySQL index foreign key columns automatically?
...million records. This is ofc MySQL 5.1 InnoDB. The table has three fields, one is primary key integer, the other is already indexed. The third was a foreign key to primary key of another table. Without adding an explicit index, lookups took several seconds here. Show index from table also didn't sho...
Why does Ruby have both private and protected methods?
...e ignored by default by RDoc when generating documentation while protected ones are not. You can always use the --all flag to include them.
– jasoares
Mar 7 '14 at 1:01
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Is the pImpl idiom really used in practice?
...ue.
Data hiding
If you're developing a library, especially a proprietary one, it might be desirable not to disclose what other libraries / implementation techniques were used to implement the public interface of your library. Either because of Intellectual Property issues, or because you believe t...
When would you use the different git merge strategies?
...e is the default for non-fast-forward merges. We're all familiar with that one.
Octopus
I've used octopus when I've had several trees that needed to be merged. You see this in larger projects where many branches have had independent development and it's all ready to come together into a single he...
List passed by ref - help me explain this behaviour
...ed myList.Sort();
Finally, when you did: myList' = myList2, you lost the one of the reference but not the original and the collection stayed sorted.
If you use by reference (ref) then myList' and myList will become the same (only one reference).
Note: I use myList' to represent the parameter t...
Deep copying an NSArray
...ple documentation about deep copies explicitly states:
If you only need a one-level-deep copy:
NSMutableArray *newArray = [[NSMutableArray alloc]
initWithArray:oldArray copyItems:YES];
The above code creates a new array whose members are shallow copies of the members...
What is the difference between supervised learning and unsupervised learning? [closed]
...d, which means that your examples must be labeled, or explicitly say which ones are faces and which ones aren't.
In an unsupervised algorithm your examples are not labeled, i.e. you don't say anything. Of course, in such a case the algorithm itself cannot "invent" what a face is, but it can try to ...
Error - trustAnchors parameter must be non-empty
...DK8 to OpenJDK8 since OpenJDK comes with an empty trust store. Copying the one from OpenJDK11 fixes the problem
– light_303
Nov 13 '18 at 9:38
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