Angular Observables and Promises - Abdelfattah Ragab - E-Book

Angular Observables and Promises E-Book

Abdelfattah Ragab

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Beschreibung

Welcome to the book "Angular Observables and Promises: A Practical Guide to Asynchronous Programming". In this book, I explain how to use observables and promises effectively for asynchronous programming. I show you practical scenarios and explain when you should use them and which operators you need to use. I will give you best practices with important pointers that, when used correctly, can make all the difference and have a big impact on performance. There are also things you should be aware of and avoid when working with observables, otherwise performance can be affected. By the end of this book, you will be able to use Observables and Promises in your Angular application and handle all kinds of scenarios. Let us get started.

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Seitenzahl: 16

Veröffentlichungsjahr: 2024

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Angular Observables and Promises

A Practical Guide to Asynchronous Programming

Abdelfattah Ragab

Introduction

Welcome to the book “Angular Observables and Promises: A Practical Guide to Asynchronous Programming”.

In this book, I explain how to use observables and promises effectively for asynchronous programming.

I show you practical scenarios and explain when you should use them and which operators you need to use.

I will give you best practices with important pointers that, when used correctly, can make all the difference and have a big impact on performance.

There are also things you should be aware of and avoid when working with observables, otherwise performance can be affected.

By the end of this book, you will be able to use Observables and Promises in your Angular application and handle all kinds of scenarios.

Let us get started.

What are Signals?

Signals are a new feature in Angular that improves the reactivity of the framework and the detection of changes.

Signals are used for synchronous operations, so you should use them to manage state and update the user interface efficiently.

I mentioned them at the beginning to illustrate the role they play in Angular. I will not go into them in this book, as synchronous operations are not the topic of this book. I will mainly focus on the asynchronous operations.

What is RxJS?

RxJS (Reactive Extensions for JavaScript) is a powerful reactive programming library that uses observables to manage asynchronous data streams. It enables developers to work with asynchronous operations in a declarative style, making it easier to handle complex data streams and events.

What are Observables?

Observables are part of the RxJS library that allow you to handle asynchronous data streams.

What are Promises?

A promise in JavaScript is an object that represents the eventual completion or failure of an asynchronous operation.

A promise handles one single value.

new Promise