An Apex design patterns is a reusable solution to a common problem or design challenge that can be applied when building applications on the Salesforce platform. Design patterns provide a way to structure code in a way that is modular, scalable, and easy to understand, making it easier to build and maintain complex applications.
Types of design patterns :
Singleton: A singleton pattern ensures that a class has only one instance, and provides a global access point to that instance. This is useful for cases where you want to limit the number of instances of a class that can be created.
Read more: Apex Singleton Design Pattern
Factory: A factory pattern defines an interface for creating objects in a super class, but allows subclasses to alter the type of objects that will be created. This is useful for cases where you want to create objects of different types based on input or runtime conditions.
Read more: Factory design pattern
Command: A command pattern encapsulates a request as an object, allowing you to parametrize clients with different requests, queue or log requests, and support undoable operations.
Façade: A façade pattern provides a simplified interface to a complex system, hiding the complexity behind a single, easy-to-use interface. This is useful for cases where you want to provide a simplified interface to a complex system or set of APIs.
Read more: Facade Design Pattern
Builder Pattern: The builder pattern is a creational pattern – it helps you to instantiate objects in a particular way. This pattern allows you to construct complicated objects step by step. Builders help to populate immutable private variables at construction without a multiple position-based constructor argument.
Strategy Pattern: The strategy pattern is a behavioral pattern that helps you control dynamic application flow. This pattern allows us to define a family of algorithms through multiple classes which implement an interface. The choice of which implementation to use is determined at runtime.
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