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Alex Millius
iOS Development Techdegree Student 5,468 PointsIncorrect answer
I think the response for this question is false
protocol SomeProtocol {
func someMethod() -> Int
}
extension SomeProtocol {
func someMethod() -> Int {
return 1
}
}
struct SomeStruct: SomeProtocol {
func someMethod() -> Int {
return 2
}
}
let b: SomeProtocol = SomeStruct()
b.someMethod()
What is the value returned from the someMethod() call
The quizz says that the correct answer is 2. This doesn't sound right.
In any case, there is something wrong with this quiz. For the question:
let a: SomeStruct = SomeStruct()
a.someMethod
The answer given by the quiz is also 2
The two question can't have the same result
1 Answer
Greg Kaleka
39,021 PointsHi Alex,
The quiz answer is not incorrect; b.someMethod() will return 2 in this example. Try it out in a playground. The protocol extension provides a default implementation, but the definition of the struct overrides the protocol, and so that's the implementation you get.
As for the a.someMethod() and b.someMethod(), nothing is wrong there, except that it's the exact same question, which is probably a mistake. I assume something was meant to be changed between those two questions other than the name of the constant. Gabe Nadel - you may want to tweak that.
Cheers
-Greg