How to do an if-else comparison on enums with arguments [duplicate]

Answer 1

The answer is Equatable Protocol.

Now let's see how it works.

Consider this enum for example:

enum Barcode {
    case upca(Int, Int)
    case qrCode(String)
    case none
}

If we check the equatable operator == on the enum it will fail.

// Error: binary operator '==' cannot be applied to two Barcode operands
Barcode.qrCode("code") == Barcode.qrCode("code")

How to fix this using Equatable Protocol?

extension Barcode: Equatable {
}

func ==(lhs: Barcode, rhs: Barcode) -> Bool {
    switch (lhs, rhs) {
    case (let .upca(codeA1, codeB1), let .upca(codeA2, codeB2)):
        return codeA1 == codeA2 && codeB1 == codeB2

    case (let .qrCode(code1), let .qrCode(code2)):
        return code1 == code2

    case (.None, .None):
        return true

    default:
        return false
    }
}

Barcode.qrCode("code") == Barcode.qrCode("code") // true
Barcode.upca(1234, 1234) == Barcode.upca(4567, 7890) // false
Barcode.none == Barcode.none // true