Dec 17, 2020
Question marks ? in Swift, is a way that lets you indicate the possibility that a value might be absent for any type at all, without the need for special constants.
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SwiftUI is a framework to build User Interfaces (UI) for iOS apps entirely with Swift code, using a novel declarative approach.
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The high order functions in swift are as followsMap
FirstIndex and LastIndex
In Objective-C, the self is a special variable, in an instance method that refers to the receiver (object) of the message as well as invoking the method, while in a class method the self will indicate...