Book Image

Learning Angular - Third Edition

By : Aristeidis Bampakos, Pablo Deeleman
Book Image

Learning Angular - Third Edition

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)
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

Functions, lambdas, and execution flow

Functions are the processing machines we used to analyze input, digest information, and apply the necessary transformations to data that's provided either to transform the state of our application or to return an output that will be used to shape our application's business logic or user interactivity.

Functions in TypeScript are not that different from regular JavaScript, except for the fact that, just like everything else in TypeScript, they can be annotated with static types. Thus, they improve the compiler by providing it with the information it expects in their signature and the data type it aims to return, if any.

Annotating types in our functions

The following example showcases how a regular function is annotated in TypeScript:

function sayHello(name: string): string {
    return 'Hello, ' + name;
}

We can see two main differences from the usual...