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Exploring Angular — Part 13: Observables

Șener Ali 38

Exploring Angular — Part 13: Observables

Șener Ali
Level Up Coding
Published in
3 min read4 hours ago


angular observables
Angular Observables

If you missed the previous article on HttpClient Module, you can catch up right here: Exploring Angular — Part 12: HttpClient Module.

The Essence of Angular Observables

At its core, an Observable in Angular is like a stream of data or events. It represents a sequence of values that can be observed over time, making it a powerful tool for handling asynchronous operations such as network requests, user interactions, and real-time data updates.

Key Features of Observables

Angular Observables offer a range of features that simplify handling asynchronous data and events:

1. Asynchronous Data Streams: Observables enable the handling of asynchronous data, making it possible to react to data as it arrives.

2. Cancellation: Observables support cancellation, allowing you to terminate ongoing operations when they are no longer needed, improving performance.

3. Error Handling: Observables provide a structured way to handle errors and gracefully recover from them.

4. Chaining: You can chain multiple operators to transform, filter, or combine data streams, enabling complex data manipulation.

5. Hot and Cold Observables: Angular supports both hot and cold Observables, each with its specific use cases. Cold Observables start emitting data when a subscriber subscribes, while hot Observables emit data regardless of subscribers.

Using Observables

To utilize Angular Observables in your application, you need to understand the core concepts:

  1. Observable Creation: Observables can be created from various sources, such as data arrays, events, or HTTP requests. You can also create custom Observables using the Observable class.
  2. Subscriptions: To receive data from an Observable, you need to subscribe to it. A subscription is like a listener that observes the data emitted by the Observable.
  3. Operators: Operators are functions that allow you to transform, filter, or combine Observables. They enable complex data manipulation.