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What is Prefix.pch file in Xcode?

...” and enabling Precompile Prefix Header so they get precompiled. But the idea behind a prefix header is different from precompiling. A prefix header is implicitly included at the start of every source file. It’s like each source file adds #import "Prefix.pch" at the top of the file, before anyt...
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Is it possible to select the last n items with nth-child?

... var channelOptions = { tags: "".split(" "), id: "1" }; initTagRenderer("".split(" "), "".split(" "), channelOptions); StackExchange.using("externalEditor", function() { // Have to fire editor after snippets, if snippets enabled...
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AngularJS directive with default options

...ine a set of default options for my (element) directive, which can be overridden by specifying the option value in an attribute. ...
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What is Data URI support like in major email client software?

...rd 3.0 Thunderbird latest These mobile clients do show data URIs: Android 2.3 Android 4.0 BlackBerry 5 OS iPad iPhone 3GS iPhone 4S iPhone 5 None of the webmail clients showed data URIs. These desktop clients don't: Lotus Notes 6.5 Lotus Notes 7 Lotus Notes 8.5 Outlook 2000 Outlook 2002/XP ...
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C++ Double Address Operator? (&&)

I'm reading STL source code and I have no idea what && address operator is supposed to do. Here is a code example from stl_vector.h : ...
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How to downgrade or install an older version of Cocoapods

... always been the behavior, but sudo gem install cocoapods -v 0.39.0 alone didn't do the trick for me once I had 1.0.0. – fullofsquirrels May 23 '16 at 16:43 ...
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How do you get the index of the current iteration of a foreach loop?

...numeration, and cannot be done." -- This is nonsense, as the answers by David B and bcahill make clear. An index is an enumeration over a range, and there's no reason one cannot enumerate two things in parallel ... that's exactly what the indexing form of Enumerable.Select does. ...
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How to merge 2 List and removing duplicate values from it in C#

...licates due to the timestamp being different. But with the merge I can decide which unique field I want consider in the dictionary. +1 – JimSan Oct 9 '15 at 15:33 ...
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comparing 2 strings alphabetically for sorting purposes

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Why Collections.sort uses merge sort instead of quicksort?

... Highly likely from Josh Bloch §: I did write these methods, so I suppose I'm qualified to answer. It is true that there is no single best sorting algorithm. QuickSort has two major deficiencies when compared to mergesort: It's not stable (as parsif...