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Learning Angular

Learning Angular

By : Aristeidis Bampakos, Pablo Deeleman
3.4 (16)
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Learning Angular

Learning Angular

3.4 (16)
By: Aristeidis Bampakos, Pablo Deeleman

Overview of this book

Angular, loved by millions of web developers around the world, continues to be one of the top JavaScript frameworks thanks to its regular updates and new features that enable fast, cross-platform, and secure frontend web development. With Angular, you can achieve high performance using the latest web techniques and extensive integration with web tools and integrated development environments (IDEs). Updated to Angular 10, this third edition of the Learning Angular book covers new features and modern web development practices to address the current frontend web development landscape. If you are new to Angular, this book will give you a comprehensive introduction to help you get you up and running in no time. You'll learn how to develop apps by harnessing the power of the Angular command-line interface (CLI), write unit tests, style your apps by following the Material Design guidelines, and finally deploy them to a hosting provider. The book is especially useful for beginners to get to grips with the bare bones of the framework needed to start developing Angular apps. By the end of this book, you’ll not only be able to create Angular applications with TypeScript from scratch but also enhance your coding skills with best practices.
Table of Contents (19 chapters)
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1
Section 1: Getting Started with Angular
4
Section 2: Components – the Basic Building Blocks of an Angular App
9
Section 3: User Experience and Testability
15
Section 4: Deployment and Practice

Change detection strategies

Change detection is the mechanism that Angular uses internally to detect changes that occur in component properties and reflect this change to the view. It is a non-deterministic process that is triggered on specific events such as when the user clicks on a button, an asynchronous request is completed, or a setTimeout and setInterval method is executed. Angular monkey patches these types of events by overwriting their default behavior using a library called Zone.js.

Every component has a change detector that detects whether a change has occurred in its properties by comparing the current value of a property with the previous one. If there are differences, it applies the change to the template of the component. In the following snippet, when the name input property changes, as a result of an event that we mentioned earlier, the change detection mechanism runs for this component and updates the template accordingly:

@Input() name: string;
...

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