One Line Switch

Switched.swift

func switched<T: Hashable, O>(_ value: T,
                              cases: [T: O?],
                              default defaultCase: O? = nil) -> O? {

    guard let switchCase = cases[value] else {
        return defaultCase
    }

    return switchCase
}

func switched<T: Hashable, O>(_ value: T,
                              cases: [T: () -> O?],
                              default defaultCase: () -> O? = { nil }) -> O? {

    guard let switchCase = cases[value] else {
        return defaultCase()
    }

    return switchCase()
}