[ios] Swift: Testing optionals for nil

Swift 5 Protocol Extension

Here is an approach using protocol extension so that you can easily inline an optional nil check:

import Foundation

public extension Optional {

    var isNil: Bool {

        guard case Optional.none = self else {
            return false
        }

        return true

    }

    var isSome: Bool {

        return !self.isNil

    }

}

Usage

var myValue: String?

if myValue.isNil {
    // do something
}

if myValue.isSome {
    // do something
}

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