RxJS, a very popular library used in Angular, uses observer pattern under to hood. Observer pattern is great for scenarios where a change in one object needs to be communicated to other objects automatically. There are 2 building blocks of this pattern: Subject (Observable): This emits data over time. Observer: Subscribers to that Observable receive notifications (data or events) whenever the Observable emits a value. The Observer Pattern in RxJS enables Angular to handle asynchronous events efficiently. Observables emit data, while observers react to these changes, ensuring that components stay updated without manual intervention.
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