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Describe the Singleton pattern

Experience Level: Senior
Tags: Design PatternsGang of Four (GoF)

Answer

What problem does the Singleton pattern try to solve

  • The Singleton pattern is used to enforce just one object instance, all further references refer to the same underlying instance.
  • The class itself should be responsible for creating the instance of itself

How to implement it

  • Hide the constructor so the class cannot be instantiated from the external code
  • Define a public static operation GetInstance or property Current

Other information

  • It's creational pattern
  • It was defined by Gang of Four (GoF)
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