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How to go back (ctrl+z) in vi/vim
... use the u button to undo the last modification. (And Ctrl+R to redo it).
Read more about it at: http://vim.wikia.com/wiki/Undo_and_Redo
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What's the difference between RSpec and Cucumber? [closed]
...not find.
The main difference between RSpec and Cucumber are the business readability factor. Cucumber's main draw is that the specification (features) are separate from the test code, so your product owners can provide or review the specification without having to dig through code. These are the ....
How do servlets work? Instantiation, sessions, shared variables and multithreading
...tore their scoped beans as an attribute of its closest matching scope.
Thread Safety
That said, your major concern is possibly thread safety. You should now know that servlets and filters are shared among all requests. That's the nice thing about Java, it's multithreaded and different threads (re...
public friend swap member function
... and others mistakenly thought would be the case. If you were bit by this, read here.
In short: the member function is just noise, the specialization is ugly and incomplete, but the friend function is complete and works. And when you swap, either use boost::swap or an unqualified swap with std::s...
How can I check if a key exists in a dictionary? [duplicate]
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Interesting, I remember that I read somewhere in the official docs that it is better to ask for forgiveness than permission...
– Yannic Hamann
Jan 15 at 6:36
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What do
... not find implicit value for parameter evidence: =:=[Int,String]
You can read that error as "could not find evidence that Int == String"... that's as it should be! getStringLength is imposing further restrictions on the type of A than what Foo in general requires; namely, you can only invoke getSt...
Creating a singleton in Python
...h essentially recreates C-style structs in Python using metaclasses. The thread What are some (concrete) use-cases for metaclasses? also provides some examples, they generally seem to be related to declarative programming, especially as used in ORMs.
In this situation, if you use your Method #2, and...
Servlet returns “HTTP Status 404 The requested resource (/servlet) is not available”
... name, case sensitive!), and the servlet hasn't failed its initialization (read server logs for any deploy/servlet success/fail messages and the actual context path and servlet mapping), then a servlet with URL pattern of /servlet is available at http://localhost:8080/contextname/servlet.
You can ...
How to check if a file exists from inside a batch file [duplicate]
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The IF command is quite powerful. The output of IF /? will reward careful reading. For that matter, try the /? option on many of the other built-in commands for lots of hidden gems.
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Why are margin/padding percentages in CSS always calculated against width?
...ke complaining about how confusing and dumb people are in the world then spreading more confusion and stupidity. The reasoning you've provided doesn't make sense: the same argument applies to widths, yet that works just fine. All that would be needed is to set a context and direction that the hei...