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Expert Angular

You're reading from   Expert Angular Build deep understanding of Angular to set you apart from the developer crowd

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Product type Paperback
Published in Jul 2017
Publisher Packt
ISBN-13 9781785880230
Length 454 pages
Edition 1st Edition
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Authors (4):
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Sridhar Rao Chivukula Sridhar Rao Chivukula
Author Profile Icon Sridhar Rao Chivukula
Sridhar Rao Chivukula
Mathieu Nayrolles Mathieu Nayrolles
Author Profile Icon Mathieu Nayrolles
Mathieu Nayrolles
Alexandru Vasile Pop Alexandru Vasile Pop
Author Profile Icon Alexandru Vasile Pop
Alexandru Vasile Pop
Rajesh Gunasundaram Rajesh Gunasundaram
Author Profile Icon Rajesh Gunasundaram
Rajesh Gunasundaram
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Toc

Table of Contents (18) Chapters Close

Preface 1. Architectural Overview and Building a Simple App in Angular FREE CHAPTER 2. Migrating AngularJS App to Angular App 3. Using Angular CLI to Generate Angular Apps with Best Practices 4. Working with Components 5. Implementing Angular Routing and Navigation 6. Creating Directives and Implementing Change Detection 7. Asynchronous Programming Using Observables 8. Template and Data Binding Syntax 9. Advanced Forms in Angular 10. Material Design in Angular 11. Implementing Angular Pipes 12. Implementing Angular Services 13. Applying Dependency Injection 14. Handling Angular Animation 15. Integrating Bootstrap with Angular Application 16. Testing Angular Apps Using Jasmine and Protractor Frameworks 17. Design Patterns in Angular

Dependency Injection - Introduction

Dependency Injection(DI) is a coding pattern in which a class receives dependencies rather than creating them itself. Some developers and technology mavericks also refer to this as a design pattern.

It's widely used and is often called DI. We will refer to the Dependency Injection system as DI in all our sections.

Here's why we absolutely need DI:

  • DI is a software design pattern in which a class receives its dependencies rather than creating the object itself
  • DI creates and delivers objects, which are required dynamically just-in-time
  • We can consider the injectables as our application's reusable repository
  • DI allows independent development of dependency modules for remote development teams.
No Angular apps can be completely written without using DI.
Now, let's revisit the preceding code we wrote without DI and write it...
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