What is a design pattern
Design patterns are classic solutions to common problems in software design and are a summary of previous experiences.
Singleton Pattern
Ensure that a class has only one instance and provide a global access point. Commonly used for configuring classes and database connection pools.
Factory Method Mode
Define the interface for creating objects, allowing subclasses to determine which class to instantiated. Decouple object creation and usage.
Observer Pattern
Define a one to many dependency relationship where all objects that depend on it automatically receive notifications when the state of an object changes. Commonly used in event systems.
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