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Explain the difference between NSOperationQueue concurrent and non-concurrent.
In the context of an NSOperation object, which runs in an NSOperationQueue, the terms concurrent and non-concurrent do not necessarily refe...
What is the use of double question marks ???
To provide a default value for a variable. let missingName : String? = nil let realName : String? = “John Doe" let existentName :...
What is type aliasing in Swift?
This borrows very much from C/C++. It allows you to alias a type, which can be useful in many particular contexts. typealias AudioSample ...