JuniorTheoryCommon

What happens when this program is compiled and run?

SWIFT

var count = 1
let limit = 3
count = 2
limit = 4
print(count, limit)

It does not compile

Expecting 2 4: treating let like var. A constant gets its value once, so the compiler refuses limit = 4 and the program never runs.
Expecting a crash on the line limit = 4: Swift checks assignments to constants while compiling, before a single line runs.

JuniorTheoryCommon

SWIFT

var count = 1
let limit = 3
count = 2
limit = 4
print(count, limit)

It does not compile

Expecting 2 4: treating let like var. A constant gets its value once, so the compiler refuses limit = 4 and the program never runs.
Expecting a crash on the line limit = 4: Swift checks assignments to constants while compiling, before a single line runs.