Book Image

Angular Cookbook

By : Muhammad Ahsan Ayaz
Book Image

Angular Cookbook

By: Muhammad Ahsan Ayaz

Overview of this book

The Angular framework, powered by Google, is the framework of choice for many web development projects built across varying scales. It’s known to provide much-needed stability and a rich tooling ecosystem for building production-ready web and mobile apps. This recipe-based guide enables you to learn Angular concepts in depth using a step-by-step approach. You’ll explore a wide range of recipes across key tasks in web development that will help you build high-performance apps. The book starts by taking you through core Angular concepts such as Angular components, directives, and services to get you ready for building frontend web apps. You’ll develop web components with Angular and go on to cover 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 Angular book, you’ll be able to create full-fledged, professional-looking Angular apps and have the skills you need for frontend development, which are crucial for an enterprise Angular developer.
Table of Contents (15 chapters)

Using OnPush change detection to prune component subtrees

In today's world of modern web applications, performance is one of the key factors for a great user experience (UX) and, ultimately, conversions for a business. In this recipe, being the first recipe of this chapter, we're going to discuss the fundamental or the most basic optimization you can do with your components wherever it seems appropriate, and that is by using the OnPush change-detection strategy.

Getting ready

The project we are going to work with resides in Chapter12/start_here/using-onpush-change-detection, inside the cloned repositor:

  1. Open the project in Visual Studio Code (VS Code).
  2. Open the terminal and run npm install to install the dependencies of the project.
  3. Run the ng serve -o command to start the Angular app and serve it on the browser. You should see the app, as follows:

Figure 12.1 – App using OnPush change detection running at http://localhost...