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Is there a “null coalescing” operator in JavaScript?

... Update JavaScript now supports the nullish coalescing operator (??). It returns its right-hand-side operand when its left-hand-side operand is null or undefined, and otherwise returns its left-hand-side operand. Please check compatibility be...
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How do I represent a time only value in .NET?

...e time to the user, output it formatted to the user like this: DateTime.Now.ToString("t"); // outputs 10:00 PM It seems like all the extra work of making a new class or even using a TimeSpan is unnecessary. share ...
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Is there a performance difference between i++ and ++i in C++?

...ent translation units. Compiler with g++ 4.5. Ignore the style issues for now // a.cc #include <ctime> #include <array> class Something { public: Something& operator++(); Something operator++(int); private: std::array<int,PACKET_SIZE> data; }; int main () { S...
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How to stop /#/ in browser with react-router?

...outer>. From the histories documentation: In a nutshell, a history knows how to listen to the browser's address bar for changes and parses the URL into a location object that the router can use to match routes and render the correct set of components. Versions 2 and 3 In react-router 2 and...
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What is the precise meaning of “ours” and “theirs” in git?

...asic of a question, but I have searched for answers and I am more confused now than before. 7 Answers ...
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Haskell Type vs Data Constructor

...ith how binary trees work, just hang in there. You don't actually need to know how binary trees work, only that this one stores Strings in some way. We also see that both data constructors take a String argument – this is the String they are going to store in the tree. But! What if we also wante...
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How to activate an Anaconda environment

...as: set PATH=C:\Anaconda\envs\py33\Scripts;C:\Anaconda\envs\py33;%PATH% Now it should work in the command window: activate py33 The line above is the Windows equivalent to the code that normally appears in the tutorials for Mac and Linux: $ source activate py33 More info: https://groups.goo...
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How do I run msbuild from the command line using Windows SDK 7.1?

...Updates: As of MSBuild 12 (2013)/VS 2013/.NET 4.5.1+ and onward MSBuild is now installed as a part of Visual Studio. For VS2015 the path was %ProgramFiles(x86)%\MSBuild\14.0\Bin For VS2017 the path was %ProgramFiles(x86)%\Microsoft Visual Studio\2017\Enterprise\MSBuild\15.0\Bin For VS2019 the path w...
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C++ Returning reference to local variable

...dies, making the reference returned from the function worthless because it now refers to an object that doesn't exist. int main() { int& p = func1(); /* p is garbage */ } The second version does work because the variable is allocated on the free store, which is not bound to the lifeti...
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Get the current displaying UIViewController on the screen in AppDelegate.m

...oller: UIViewController *vc = self.window.rootViewController; Once you know the root view controller, then it depends on how you have built your UI, but you can possibly find out a way to navigate through the controllers hierarchy. If you give some more details about the way you defined your app...