Design Patterns for Web Development

The page says design patterns are general solutions to common software design problems, not code snippets. It argues that they help developers recognize patterns in libraries, avoid rebuilding solved problems, and share a vocabulary inside teams. It also groups patterns into creational, structural, and behavioral types.

Reading notes

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• Design patterns are general concepts you can implement in software to get expected behavior.
• The article focuses on three patterns often used in front-end development.
• Creational patterns help create objects with flexibility and code reuse.
• Structural patterns help assemble objects and classes into larger structures.
• Behavioral patterns assign responsibilities between objects and handle communication.
• Singleton restricts a class to one instance and gives global access to it.
• The pattern is used when one shared resource needs controlled access, such as databases or object state.
• Observer lets objects receive updates about events in the object they observe.
• The pattern fits cases where one object changes and other objects need updates, especially when the set of observers can change.
• Decorator adds characteristics to an object through a wrapper that contains behavior.
• The pattern is used when extra behavior must be added at runtime or inheritance is not possible.
• The page warns that design patterns are not necessary in every project and recommends weighing pros and cons before using them.