JuniorTheoryCommon

What happens when this program is compiled and run?

SWIFT

let word = "Swift"
let first = word[0]
print(first)

It does not compile

Expecting S, as s[0] gives in many languages. Characters in Swift take different numbers of bytes, so a string can't be indexed with an Int, and word[0] does not compile.
Expecting a crash at run time, as with an index past the end. Here the compiler already rejects indexing with an Int, so the program never starts.

JuniorTheoryCommon

SWIFT

let word = "Swift"
let first = word[0]
print(first)

It does not compile

Expecting S, as s[0] gives in many languages. Characters in Swift take different numbers of bytes, so a string can't be indexed with an Int, and word[0] does not compile.
Expecting a crash at run time, as with an index past the end. Here the compiler already rejects indexing with an Int, so the program never starts.