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What does .SD stand for in data.table in R
.SD looks useful but I do not really know what I am doing with it. What does it stand for? Why is there a preceding period (full stop). What is happening when I use it?
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Calculate age given the birth date in the format YYYYMMDD
...can I calculate an age in years, given a birth date of format YYYYMMDD? Is it possible using the Date() function?
40 Answ...
What is a “Stub”?
So, carrying on with my new years resolution to get more in to TDD, I am now starting to work more with Rhino Mocks .
6 An...
How to output in CLI during execution of PHP Unit tests?
When running a PHPUnit test, I would like to be able to dump output so I can debug one or two things.
17 Answers
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.gitignore and “The following untracked working tree files would be overwritten by checkout”
So I added a folder to my .gitignore file.
29 Answers
29
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check if directory exists and delete in one command unix
Is it possible to check if a directory exists and delete if it does,in Unix using a single command? I have situation where I use ANT 'sshexec' task where I can run only a single command in the remote machine. And I need to check if directory exists and delete it...
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How should equals and hashcode be implemented when using JPA and Hibernate
...ss's equals and hashcode be implemented in Hibernate? What are the common pitfalls? Is the default implementation good enough for most cases? Is there any sense to use business keys?
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How to run a single RSpec test?
...nfig.filter_run_when_matching :focus
end
And then add a focus tag to the it, context or describe to run only that block:
it 'runs a test', :focus do
...test code
end
RSpec documentation:
https://www.rubydoc.info/github/rspec/rspec-core/RSpec/Core/Configuration#filter_run_when_matching-instan...
Default value to a parameter while passing by reference in C++
Is it possible to give a default value to a parameter of a function while we are passing the parameter by reference. in C++
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Send and receive messages through NSNotificationCenter in Objective-C?
...nter defaultCenter] removeObserver:self];
[super dealloc];
}
- (id) init
{
self = [super init];
if (!self) return nil;
// Add this instance of TestClass as an observer of the TestNotification.
// We tell the notification center to inform us of "TestNotification"
// notifica...