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Number of days in particular month of particular year?

How to know how many days has particular month of particular year? 20 Answers 20 ...
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What does “hashable” mean in Python?

I tried searching internet but could not find the meaning of hashable. 9 Answers 9 ...
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initializer_list and move semantics

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How to implement Enums in Ruby?

...best way to implement the enum idiom in Ruby? I'm looking for something which I can use (almost) like the Java/C# enums. 25...
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What is a mixin, and why are they useful?

In " Programming Python ", Mark Lutz mentions "mixins". I'm from a C/C++/C# background and I have not heard the term before. What is a mixin? ...
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Convert NSArray to NSString in Objective-C

I am wondering how to convert an NSArray [@"Apple", @"Pear ", 323, @"Orange"] to a string in Objective-C . 9 Answers ...
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How to check if a string array contains one string in JavaScript? [duplicate]

... string. I'd like to test this string against the array values and apply a condition the result - if the array contains the string do "A", else do "B". ...
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In Java, what is the best way to determine the size of an object?

I have an application that reads a CSV file with piles of data rows. I give the user a summary of the number of rows based on types of data, but I want to make sure that I don't read in too many rows of data and cause OutOfMemoryError s. Each row translates into an object. Is there an easy way t...
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eclipse won't start - no java virtual machine was found

Eclipse was running fine yesterday (and has been since I installed it about a year ago). Now all the sudden I'm getting the following error on startup: ...
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Deleting all records in a database table

How do I delete all records in one of my database tables in a Ruby on Rails app? 7 Answers ...