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Checking if a variable is an integer

Does Rails 3 or Ruby have a built-in way to check if a variable is an integer? 11 Answers ...
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What values should I use for CFBundleVersion and CFBundleShortVersionString?

This is my first iOS app submission and I don't want my app rejected. 7 Answers 7 ...
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What are the differences between ArrayList and Vector?

What are the differences between the two data structures ArrayList and Vector , and where should you use each of them? 7...
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How to read a .xlsx file using the pandas Library in iPython?

I want to read a .xlsx file using the Pandas Library of python and port the data to a postgreSQL table. 6 Answers ...
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How to check if a python module exists without importing it

I need to know if a python module exists, without importing it. 13 Answers 13 ...
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Rounding a double to turn it into an int (java)

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How to duplicate virtualenv

I have an existing virtualenv with a lot of packages but an old version of Django. 6 Answers ...
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Pros and cons of Java rules engines [closed]

What are the pros and cons to adopting the Java rules engines JESS and Drools ? Are there any other players? 5 Answers ...
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Can I write into the console in a unit test? If yes, why doesn't the console window open?

I have a test project in Visual Studio. I use Microsoft.VisualStudio.TestTools.UnitTesting . 12 Answers ...
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Extracting the last n characters from a string in R

How can I get the last n characters from a string in R? Is there a function like SQL's RIGHT? 15 Answers ...