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Determining Whether a Directory is Writeable
What would be the best way in Python to determine whether a directory is writeable for the user executing the script? Since this will likely involve using the os module I should mention I'm running it under a *nix environment.
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How to randomize (shuffle) a JavaScript array?
I have an array like this:
58 Answers
58
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What are the pros and cons of performing calculations in sql vs. in your application
...gregate a lot of data, doing it at the db server will save bandwidth, and disk io if the aggregates can be done inside indexes)
convenience (sql is not the best language for complex work - especially not great for procedural work, but very good for set-based work; lousy error-handling, though)
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Which one will execute faster, if (flag==0) or if (0==flag)?
...ause it seems that many did not get it right and it gives room for a nice discussion on compiler optimization :)
The answer is:
What is flag's type?
In the case where flag actually is a user-defined type. Then it depends on which overload of operator== is selected. Of course it can seem stupi...
Determine the number of NA values in a column
... 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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Why is a git 'pull request' not called a 'push request'?
The terminology used to merge a branch with an official repository is a 'pull request'. This is confusing, as it appears that I am requesting to push my changes to the official repository.
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Scala type programming resources
According to this question , Scala's type system is Turing complete . What resources are available that enable a newcomer to take advantage of the power of type-level programming?
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How can I check if a program exists from a Bash script?
How would I validate that a program exists, in a way that will either return an error and exit, or continue with the script?
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How to add test coverage to a private constructor?
This is the code:
18 Answers
18
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How to create a MySQL hierarchical recursive query
I have a MySQL table which is as follows:
15 Answers
15
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