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How do I concatenate or merge arrays in Swift?

...ith Sequence's flatMap(_:) method Swift provides a flatMap(_:) method for all types that conform to Sequence protocol (including Array). flatMap(_:) has the following declaration: Returns an array containing the concatenated results of calling the given transformation with each element of this ...
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Output to the same line overwriting previous output?

...o need to import the sys module for this sort of simple usage. print() actually has a number of keyword arguments which can be used to greatly simplify code. To use the same code on Python 2.6+, put the following line at the top of the file: from __future__ import print_function ...
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UIPanGestureRecognizer - Only vertical or horizontal

I have a view that has a UIPanGestureRecognizer to drag the view vertically. So in the recognizer callback, I only update the y-coordinate to move it. The superview of this view, has a UIPanGestureRecognizer that will drag the view horizontally, just updating the x-coordinate. ...
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C++0x has no semaphores? How to synchronize threads?

...ck Overflow regarding the use of semaphores. I use them (posix semaphores) all the time to let a thread wait for some event in another thread: ...
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How to initialize a private static const map in C++?

... int>’ as ‘this’ argument of ‘std::map<_Key, _Tp, _Compare, _Alloc>::mapped_type& std::map<_Key, _Tp, _Compare, _Alloc>::operator[](const key_type&) [with _Key = int; _Tp = int; _Compare = std::less<int>; _Alloc = std::allocator<std::pair<const int, int>...
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Check if a class has a member function of a given signature

...oid ReportMemUsage(const TMap& m, std::true_type) { // We may call used_memory() on m here. } template<typename TMap> void ReportMemUsage(const TMap&, std::false_type) { } template<typename TMap> void ReportMemUsage(const TMap& m) { ReportMemUsage(m, std:...
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What's the difference between utf8_general_ci and utf8_unicode_ci?

...languages or characters. On modern servers, this performance boost will be all but negligible. It was devised in a time when servers had a tiny fraction of the CPU performance of today's computers. Benefits of utf8mb4_unicode_ci over utf8mb4_general_ci utf8mb4_unicode_ci, which uses the Unicode r...
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How can I read SMS messages from the device programmatically in Android?

...ForResult(intent, 1); }else { List<Sms> lst = getAllSms(); } }else { List<Sms> lst = getAllSms(); } Set app as default SMS app @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == 1...
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How to convert a Django QuerySet to a list

... Why not just call list() on the Queryset? answers_list = list(answers) This will also evaluate the QuerySet/run the query. You can then remove/add from that list. ...
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Regular Expression for alphanumeric and underscores

...o or more of the given characters $ : end of string If you don't want to allow empty strings, use + instead of *. As others have pointed out, some regex languages have a shorthand form for [a-zA-Z0-9_]. In the .NET regex language, you can turn on ECMAScript behavior and use \w as a shorthand (y...