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How to create abstract properties in python abstract classes
...I create a base abstract class Base . I want all the classes that inherit from Base to provide the name property, so I made this property an @abstractmethod .
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Setting default values for columns in JPA
...ult value.
Note this will serve you if you're only accessing the database from this application. If other applications also use the database, then you should make this check from the database using Cameron's columnDefinition annotation attribute, or some other way.
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How do I debug Node.js applications?
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node-inspector could save the day! Use it from any browser supporting WebSocket. Breakpoints, profiler, livecoding, etc... It is really awesome.
Install it with:
npm install -g node-inspector
Then run:
node-debug app.js
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How to convert a Java 8 Stream to an Array?
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If you want to get an array of ints, with values form 1 to 10, from a Stream, there is IntStream at your disposal.
Here we create a Stream with a Stream.of method and convert an Stream to an IntStream using a mapToInt. Then we can call IntStream's toArray method.
Stream<Integer> ...
How to find out which package version is loaded in R?
...es is the current version installed at the location the package was loaded from: it can be wrong if another process has been changing packages during the session." So: if you want to know wether the package is loaded or not, better use "Rmpi" %in% loadedNamespaces() ; if you want to know which versi...
Git rebase --continue complains even when all merge conflicts have been resolved
...g the conflict, you remove everything in your new patch, keeping only code from the branch you rebased on. Now when you add the file, it will be exactly like the one you tried to rebase on. git status will show no green line displaying the modified files. Now, if you do
git rebase --continue
git ...
Glorified classes in the Java language
Some classes in the standard Java API are treated slightly different from other classes. I'm talking about those classes that couldn't be implemented without special support from the compiler and/or JVM.
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How to display line numbers in 'less' (GNU)
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From the manual:
-N or --LINE-NUMBERS
Causes a line number to be displayed at the beginning of each
line in the display.
You can also toggle line numbers without quitting less by typing -N.
I...
How to convert a string to lower or upper case in Ruby
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.titleize is from Rails. Cannot find it in ruby String documentation
– ronald8192
Apr 12 '17 at 19:36
5
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Implications of foldr vs. foldl (or foldl')
...st element (which, in the example above, would itself be an infinite list, from INF down to 1).
– Will Ness
Mar 24 '17 at 7:37
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