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Ruby class instance variable vs. class variable

I read " When do Ruby instance variables get set? " but I'm of two minds when to use class instance variables. 7 Answers ...
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Check whether or not the current thread is the main thread

Is there any way to check whether or not the current thread is the main thread in Objective-C? 13 Answers ...
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What are .a and .so files?

I'm currently trying to port a C application to AIX and am getting confused. What are .a and .so files and how are they used when building/running an application? ...
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Can a div have multiple classes (Twitter Bootstrap) [duplicate]

Can a div tag have two classes? 9 Answers 9 ...
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Two arrays in foreach loop

I want to generate a selectbox using two arrays, one containing the country codes and another containing the country names. ...
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What is offsetHeight, clientHeight, scrollHeight?

Thought of explaining what is the difference between offsetHeight , clientHeight and scrollHeight or offsetWidth , clientWidth and scrollWidth ? ...
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Why can lambdas be better optimized by the compiler than plain functions?

In his book The C++ Standard Library (Second Edition) Nicolai Josuttis states that lambdas can be better optimized by the compiler than plain functions. ...
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Limiting the number of records from mysqldump?

I am trying to load a small sample of records from a large database into a test database. 4 Answers ...
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SQL is null and = null [duplicate]

What is the difference between 4 Answers 4 ...
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python assert with and without parenthesis

Here are four simple invocations of assert: 5 Answers 5 ...