Book Image

Essential Angular

By : Victor Savkin, Jeff Cross
Book Image

Essential Angular

By: Victor Savkin, Jeff Cross

Overview of this book

Essential Angular is a concise, complete overview of the key aspects of Angular, written by two Angular core contributors. The book covers the framework's mental model, its API, and the design principles behind it. This book is fully up to date with the latest release of Angular. Essential Angular gives you a strong foundation in the core Angular technology. It will help you put all the concepts into the right places so you will have a good understanding of why the framework is the way it is. Read this book after you have toyed around with the framework, but before you embark on writing your first serious Angular application. This book covers concepts such as the differences between Just-In-Time (JIT) and Ahead-Of-Time (AOT) compilation in Angular, alongside NgModules, components and directives. It also goes into detail on Dependency Injection and Change Detection: essential skills for Angular developers to master. The book finishes with a look at testing, and how to integrate different testing methodologies in your Angular code.
Table of Contents (11 chapters)


Since AOT is so advantageous, we recommend to use it in production. But, as with everything, there are trade-offs. For Angular to be able to compile your application ahead of time, the metadata has to be statically analyzable. For instance, the following code will not work in the AOT mode:

selector: 'talk-cmp',
template: () => window.hide ? 'hidden' : `
{{talk.title}} {{talk.speaker}}
Rating: {{ talk.rating | formatRating }}
<watch-button [talk]="talk"></watch-button>
<rate-button [talk]="talk" (click)="onRate()"></rate-button>
class TalkCmp {

The window.hide property will not be defined. So the compilation will fail to point out the error. A lot of work has been done to make the compiler smarter, so it can understand most of the day-to-day patterns you would use when building your application...