Creating an extension to filter nils from an Array in Swift

Question

I\'m trying to write an extension to Array which will allow an array of optional T\'s to be transformed into an array of non-optional T\'s.

e.g. this could be writte

Answer 1

Swift 4

If you are fortunate enough to be using Swift 4 then you can filter out nil values using compactMap

array = array.compactMap { $0 }

E.g.

let array = [1, 2, nil, 4]
let nonNilArray = array.compactMap { $0 }

print(nonNilArray)
// [1, 2, 4]