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Difference between modes a, a+, w, w+, and r+ in built-in open function?

In the python built-in open function, what is the exact difference between the modes w , a , w+ , a+ , and r+ ? 6 An...
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Difference between a theta join, equijoin and natural join

...e please help me better understand it? If I use the = sign on a theta join is it exactly the same as just using a natural join? ...
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What is tail call optimization?

Very simply, what is tail-call optimization? 10 Answers 10 ...
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valueOf() vs. toString() in Javascript

...hought that the toString() method got invoked whenever a string conversion is called for, but apparently it is trumped by valueOf(). ...
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Difference between acceptance test and functional test?

What is the real difference between acceptance tests and functional tests? 11 Answers ...
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When should an IllegalArgumentException be thrown?

I'm worried that this is a runtime exception so it should probably be used sparingly. Standard use case: 6 Answers ...
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What does an exclamation mark mean in the Swift language?

... What does it mean to "unwrap the instance"? Why is it necessary? As far as I can work out (this is very new to me, too)... The term "wrapped" implies we should think of an Optional variable as a present, wrapped in shiny paper, which might (sadly!) be empty. When "wrap...
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Fastest way to determine if an integer is between two integers (inclusive) with known sets of values

Is there a faster way than x >= start && x <= end in C or C++ to test if an integer is between two integers? ...
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How do cache lines work?

... If the cache line containing the byte or word you're loading is not already present in the cache, your CPU will request the 64 bytes that begin at the cache line boundary (the largest address below the one you need that is multiple of 64). Modern PC memory modules transfer 64 bits (8 ...
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What is the difference between std::array and std::vector? When do you use one over other? [duplicat

What is the difference between std::array and std::vector ? When do you use one over other? 6 Answers ...