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Singleton

Another creational design pattern used to ensure there is only ever one instance in use.

class Singleton { private static instance: Singleton; public value: number = 4; private constructor() {} static getSharedInstance() { if (!Singleton.instance) { Singleton.instance = new Singleton(); } return Singleton.instance; } } const singletonOne = Singleton.getSharedInstance(); singletonOne.value = 12; console.log('S1 value:', singletonOne.value); // 12 const singletonTwo = Singleton.getSharedInstance(); singletonTwo.value = 21; console.log('S2 value:', singletonTwo.value); // 21 console.log('S1 value:', singletonOne.value); // 21

Repository

https://github.com/okeeffed/developer-notes-nextjs/content/design-patterns/singleton

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