Can you explain completion handler?

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What is an attribute in swift?

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Swift defines the AnyObject type alias to represent instances of any reference type, and it’s internally defined as a protocol. Consider the following code: var array = [AnyObject]() struct Test {} array.append(Test()) This code generates a compilation error, with the following error message: Type 'Test' does not conform to protocol 'AnyObject' The failure is obvious because a struct is a value and not a reference type, and as such it doesn’t implement and cannot be cast to the AnyObject protocol. Now consider the following code: var array = [AnyObject]() array.append(1) array.append(2.0) array.append("3") array.append([4, 5, 6]) array.append([7: "7", 8: "8"]) struct Test {} array.append(Test()) The array array is filled in with values of type respectively int, double, string, array and dictionary. All of them are value types and not reference types, and in all cases no error is reported by the compiler. Why?

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What is the meaning of question mark "?" In swift?

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How does closure work in swift?

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What is the function of swift?

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Explain what is optional chaining?

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What is base class in swift?

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Why swift is the best language?

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What is de-initializer and how it is written in Swift?

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Explain some biggest changes in usernotifications.

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How long does a swift transfer take?

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