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performSelector may cause a leak because its selector is unknown

I'm getting the following warning by the ARC compiler: 19 Answers 19 ...
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Checking in of “commented out” code [closed]

Ok, here is something that has caused some friction at my current job and I really didn't expect it to. Organized in house software development is a new concept here and I have drawn up a first draft of some coding guidelines. ...
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Why create “Implicitly Unwrapped Optionals”, since that implies you know there's a value?

Why would you create a "Implicitly Unwrapped Optional" vs creating just a regular variable or constant? If you know that it can be successfully unwrapped then why create an optional in the first place? For example, why is this: ...
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Is there a way to cache GitHub credentials for pushing commits?

...itched to synchronizing my repositories to https:// on GitHub (due to firewall issues), and it asks for a password every time. ...
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How to avoid null checking in Java?

I use object != null a lot to avoid NullPointerException . 62 Answers 62 ...
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Why shouldn't I use PyPy over CPython if PyPy is 6.3 times faster?

I've been hearing a lot about the PyPy project. They claim it is 6.3 times faster than the CPython interpreter on their site . ...
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How to implement custom JsonConverter in JSON.NET to deserialize a List of base class objects?

I am trying to extend the JSON.net example given here http://james.newtonking.com/projects/json/help/CustomCreationConverter.html ...
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What is the difference between atomic / volatile / synchronized?

How do atomic / volatile / synchronized work internally? 7 Answers 7 ...
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Spring @Transactional - isolation, propagation

Can someone explain what isolation & propagation parameters are for in the @Transactional annotation via real-world example? ...
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PHP Session Fixation / Hijacking

I'm trying to understand more about PHP Session Fixation and hijacking and how to prevent these problems. I've been reading the following two articles on Chris Shiflett's website: ...