[Optional+Sugar] Adds nice ways to interact with optionals #swift

OptionalType+Sugar.swift

/// Type erased Optional protocol
protocol OptionalType {
    associatedtype WrapType

    var isSome: Bool { get }
    var isNone: Bool { get }

    var unsafelyUnwrapped: WrapType { get }
}

extension Optional: OptionalType {
    /// Runs the closure if the item is available
    func then(_ closure: (Wrapped) -> Void) {
        if let wrapped = self { closure(wrapped) }
    }

    /// Returns true iff value is not nil
    var isSome: Bool {
        return self != nil
    }

    /// Returns true iff value is nil
    var isNone: Bool {
        return !isSome
    }
}