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How do I check OS with a preprocessor directive?

I need my code to do different things based on the operating system on which it gets compiled. I'm looking for something like this: ...
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Why do Python's math.ceil() and math.floor() operations return floats instead of integers?

Can someone explain this (straight from the docs - emphasis mine): 8 Answers 8 ...
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Why does the month argument range from 0 to 11 in JavaScript's Date constructor?

When initializing a new Date object in JavaScript using the below call, I found out that the month argument counts starting from zero. ...
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Iterate over object attributes in python

I have a python object with several attributes and methods. I want to iterate over object attributes. 8 Answers ...
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Bash if [ false ] ; returns true

Been learning bash this week and ran into a snag. 6 Answers 6 ...
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Undo git pull, how to bring repos to old state

Is there any way to revert or undo git pull so that my source/repos will come to old state that was before doing git pull ? I want to do this because it merged some files which I didn't want to do so, but only merge other remaining files. So, I want to get those files back, is that possible? ...
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PHP's array_map including keys

...ond_key" => "second_value"); array_walk($test_array, function(&$a, $b) { $a = "$b loves $a"; }); var_dump($test_array); // array(2) { // ["first_key"]=> // string(27) "first_key loves first_value" // ["second_key"]=> // string(29) "second_key loves second_value" // } It does ...
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How do I use $rootScope in Angular to store variables?

How do I use $rootScope to store variables in a controller I want to later access in another controller? For example: 8 A...
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Replacing NAs with latest non-NA value

In a data.frame (or data.table), I would like to "fill forward" NAs with the closest previous non-NA value. A simple example, using vectors (instead of a data.frame ) is the following: ...
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Why is the minimalist, example Haskell quicksort not a “true” quicksort?

Haskell's website introduces a very attractive 5-line quicksort function , as seen below. 11 Answers ...