Strange optional resolution

[toph42 (Topher Hickman)]

This reply in another thread goes into a great explanation of why the distinction is important:

Why does optional binding allow multiple levels of optionality?

I may try, using our if let y = x.first example. Array.first is documented as "If the collection is empty, the value of this property is nil". OK, so we can build as isEmpty function which accepts any array and uses first in order to compute its result: func isEmpty<T>(_ x: [T]) -> Bool { if let y = x.first { return false } else { return true } } And we expect isEmpty to return false for [nil, 1, 2]: let x: [Int?] = [nil, 1, 2] let result = isEmpty(x) print(result) // false Do you agr…