Singleton with properties in Swift 3

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For me this is the best way, make init private. Swift 3 \ 4 \ 5 syntax

// MARK: - Singleton

final class Singleton {

    // Can't init is singleton
    private init() { }

    // MARK: Shared Instance

    static let shared = Singleton()

    // MARK: Local Variable

    var emptyStringArray = [String]()

}

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