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Angular Cookbook

Angular Cookbook

By : Muhammad Ahsan Ayaz
4 (13)
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Angular Cookbook

Angular Cookbook

4 (13)
By: Muhammad Ahsan Ayaz

Overview of this book

Angular has long been the framework of choice for web development projects of various scales, offering much-needed stability and a rich tooling ecosystem for building production-ready web and mobile apps. This recipe-based guide ensures high performance apps with the latest version of Angular, helping you to build up your Angular expertise with a wide range of recipes across key tasks in web development. In this second edition, the recipes have been updated, added, and improved based on developer feedback, new challenges, and Angular 17. The first few chapters will show you how to utilize core Angular concepts such as components, directives, and services to get you ready for building frontend web apps. You’ll then develop web components with Angular and go on to learn about advanced concepts such as dynamic components loading and state management with NgRx for achieving real-time performance. Later chapters will focus on recipes for effectively testing your Angular apps to make them fail-safe, before progressing to techniques for optimizing your app’s performance. Finally, you’ll create Progressive Web Apps (PWA) with Angular to provide an intuitive experience for users. By the end of this book, you’ll be able to create full-fledged, professional-looking Angular apps and have the skills you need for frontend development.
Table of Contents (16 chapters)
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14
Other Books You May Enjoy
15
Index

Using Angular DI tokens

In this recipe, you’ll learn how to create a basic DI token. We will create it for a regular TypeScript class, to be used as an Angular service using DI. We have a class named Jokes in our application, which is used in the AppComponent by manually creating a new instance of the class. This makes our code tightly coupled and hard to test, since the AppComponent class directly uses the Jokes class.

In other words, when running the tests for the App component, we now rely on the Jokes class, and if something changes in that class, our test will break. Since Angular is all about DI and services, we’ll use a DI token to use the Jokes class as an Angular service. We’ll use the InjectionToken method to create a DI token, and then the @Inject decorator to enable us to use the class in our service.

Getting ready

The app that we are going to work with resides in start/apps/chapter03/ng-di-token inside the cloned repository:

    ...

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