JuniorTheoryCommon

What does the program print?

SWIFT

let a = Int("0") ?? 5
let b = Int("five") ?? 5
print(a, b)

0 5

Expecting 5 5: treating 0 as an empty value. ?? takes the default only for nil, and Int("0") holds the real number 0.
Expecting Int("five") to give 0 or to crash the program: a text that is not a number gives nil, and ?? puts 5 in its place.