JuniorTheoryCommon

What does the program print?

SWIFT

enum Order {
    case tea
    case coffee(cups: Int)
}
func cost(_ order: Order) -> Int {
    switch order {
    case .tea: return 2
    case .coffee(let cups) where cups > 2: return cups * 2
    case .coffee(let cups): return cups * 3
    }
}
print(cost(.coffee(cups: 2)), cost(.coffee(cups: 4)))

6 8

Expecting 4 8: reading where as a remark. A branch with where runs only when its condition holds; otherwise the switch checks the next branch.
Expecting a compile error because there is no default: a switch on an enum compiles once every case has a branch.

What does the program print if you swap the two .coffee branches?
How would you read the number of cups with if case instead of a switch?

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JuniorTheoryCommon

What does the program print?

SWIFT

enum Order {
    case tea
    case coffee(cups: Int)
}
func cost(_ order: Order) -> Int {
    switch order {
    case .tea: return 2
    case .coffee(let cups) where cups > 2: return cups * 2
    case .coffee(let cups): return cups * 3
    }
}
print(cost(.coffee(cups: 2)), cost(.coffee(cups: 4)))

6 8

Expecting 4 8: reading where as a remark. A branch with where runs only when its condition holds; otherwise the switch checks the next branch.
Expecting a compile error because there is no default: a switch on an enum compiles once every case has a branch.

What does the program print if you swap the two .coffee branches?
How would you read the number of cups with if case instead of a switch?

Back to questions Open topic in roadmap →Answer it yourself — Quiz