What does "Observer pattern" mean in programming?
Observer pattern is one of the most common terms in software development. This guide explains what it means, how it is used in practice, and why it matters, with real examples from the developer world.
Definition
A design pattern where an object (the subject) maintains a list of dependents (observers) and notifies them automatically when its state changes. The foundation of event-driven programming, React's state management, and pub/sub systems.
Example
"The order service uses the Observer pattern: when an order is placed, it notifies the email service, the inventory service, and the analytics service."
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