What is the null object pattern and how does it relate to singletons?

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what is the singleton design pattern Informational

• Can a cache be implemented as a singleton?
• How does the singleton pattern relate to different approaches to managing and auditing configuration changes or deployments in complex and evolving application environments?
• Discuss the use of reflection to break the singleton property and how to prevent it effectively.
• What are the disadvantages of a singleton configuration manager?
• Can the singleton pattern be implemented in functional programming languages?
• Are enum singletons thread-safe by default?
• What are some strategies for managing the lifecycle and cleanup of singleton instances in long-running applications or services?
• Discuss the potential for singletons to create challenges when implementing features like A/B testing or feature flags.
• What are some strategies for managing the configuration and deployment of singleton instances in different environments (e.g., development, testing, production)?
• What are the potential performance bottlenecks associated with singleton implementations?