1.Strategy Design Pattern

This pattern enables you to switch between techniques for a specific task at runtime without the client knowing it. Rather than implementing a single method directly, the code is given runtime instructions that tell it which of the group of algorithms to run.The “Open-Closed design principle,” which argues that base code should be open for extension but closed for modification, was one of the vital principles I learned about in my fourth year of university (which I’m sure many of you have heard of).One way to achieve the open-closed principle is to use the strategy pattern.When numerous algorithms for a given strategy (interface) are required, this pattern comes in handy.

2.Singleton Design Pattern

The singleton pattern is used when only one instance of a class is required. The primary motive for limiting the instantiation of a class is to maintain control over shared resources such as databases, stores, and files. With this technique, we construct a class instance and give that instance global access.For anything launched with an API key, I’ve used a singleton as the source of configuration settings for a client-side web app, as well as for holding data in memory in a client-side web application using flux.Because singletons do not need a state, they are used to implement comparators. Because we are just constructing a single model, we can conserve memory.

3.Observer Design Pattern

The one-to-many relationship between the numerous objects is the basis for this design pattern. It enables you to set up a subscription mechanism that permits other entities to be alerted of each occurrence on the entity to which you are subscribed.Kafka, RabbitMQ, Amazon SNS, and NATS are some real-world examples of pub/sub systems that implement.

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