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iOS Intermediate Swift 2 Extensions and Protocols Extensions and Protocols

Wai Hong Low
PLUS
Wai Hong Low
Courses Plus Student 6,859 Points
Posted by Wai Hong Low
Wai Hong Low
Courses Plus Student 6,859 Points

intermediate swift 2 quiz

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

I thought it's suppose to be 1 instead 2?

1 Answer

Gavin Maxwell
Gavin Maxwell
3,521 Points
Gavin Maxwell
Gavin Maxwell
3,521 Points

No, 2 is correct because SomeStruct adheres to the SomeProtocol and overrides the SomeMethod method - so when you call SomeMethod on your object b it's calling the method that returns 2.