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Enums and match

An enum lists the possible kinds of a value. Each kind can carry data, and match takes it apart:

pleno

enum Payment {
    Cash,
    Card(last4),
    Transfer(bank, reference)
}

fn describe(payment: Payment): String {
    match (payment) {
        case Payment.Cash => return "cash",
        case Payment.Card(digits) => return `card ending ${digits}`,
        case Payment.Transfer(bank, _) => return `transfer from ${bank}`
    }
}

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Finish area so it also handles Shape.Triangle(base, height).

Enums and match ​

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Enums and match

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