script.md

Singleton in Swift

In Swift, the Singleton pattern ensures a class has only one instance with a global access point. It's useful for managing shared resources or coordinating actions. However, overuse can lead to issues like hidden dependencies and testing difficulties. A Singleton in Swift is created using a static property and a private initializer to ensure only one instance exists. For example, a Universe class with a shared static property and a private initializer demonstrates a Singleton, accessed via Universe.shared. Remember to use Singletons sparingly for maintainable and testable code.

class Universe {
    static let shared = Universe()

    private init() {
        // Private initialization to ensure
        // just one instance is created.
        print("Creating the universe...")
    }

    func bigBang() {
        print("Boom! Universe created.")
    }
}

// Access the singleton
Universe.shared.bigBang()

Reference

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