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How to create has_and_belongs_to_many associations in Factory girl
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How do I get an empty array of any size in python?
I basically want a python equivalent of this in C:
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Determine the number of NA values in a column
I want to count the number of NA values in a data frame column. Say my data frame is called df , and the name of the column I am considering is col . The way I have come up with is following:
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How does the “final” keyword in Java work? (I can still modify an object.)
In Java we use final keyword with variables to specify its values are not to be changed.
But I see that you can change the value in the constructor / methods of the class. Again, if the variable is static then it is a compilation error.
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UnmodifiableMap (Java Collections) vs ImmutableMap (Google) [duplicate]
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Recent file history in Vim?
I would like to access recent files that I had opened and then closed in GVim. I open and close GVim frequently. I would like to access recent files from previous sessions as well.
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Explaining Apache ZooKeeper
... to understand ZooKeeper, how it works and what it does. Is there any application which is comparable to ZooKeeper?
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iOS Tests/Specs TDD/BDD and Integration & Acceptance Testing
What are the best technologies to use for behavior-driven development on the iPhone? And what are some open source example projects that demonstrate sound use of these technologies? Here are some options I've found:
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Regex using javascript to return just numbers
...ring like "something12" or "something102", how would I use a regex in javascript to return just the number parts?
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Sorting an IList in C#
So I came across an interesting problem today. We have a WCF web service that returns an IList. Not really a big deal until I wanted to sort it.
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