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Switching to the One Angular

Although the content of this book can be properly digested without any prior AngularJS or Angular experience, you will get most of the book if you are familiar with the basics of AngularJS and you are willing to switch to Angular.

On the internet, often AngularJS and Angular 1 are used interchangeably to refer to the AngularJS framework. This misconception leaves AngularJS experts confused about the Angular versioning. Very often, in many community events, I get questions similar to this one:

I just learnt Angular X, but I heard that Angular X+1 is coming in 6 months. Does this mean I should learn a new framework?

Here, you can replace X with any number bigger than 2.

The short answer to this question is: no, you don't have to learn a new framework when a new major version is released. In fact, the API deprecations between Angular 2 and Angular 5 can be listed on a few lines.

This confusion was brought mostly by incorrectly referring to AngularJS as Angular 1, which makes developers believe that every new version of Angular will be as different from the old one as Angular is from AngularJS.

Along the remaining sections of this chapter and in Chapter 2, Get Going with Angular, we will explain how Angular differs from AngularJS and why the development of a new framework was required.

Angular and SemVer

AngularJS was rewritten from scratch and replaced with its successor, Angular 2. A lot of us were bothered by this big step, which didn't allow us to have a smooth transition between these two versions of the framework. Right after Angular 2 was stable, Google announced that they wanted to follow the so called Semantic Versioning Specification (also known as SemVer).

SemVer defines the version of a given software project as the triple X.Y.Z, where Z is called patch version, Y is called minor version, and X is called major version. A change in the patch version means that there are no intended breaking changes impacting the public API surface between two versions of the same project, but only bug fixes. The minor version of a project will be incremented when new functionality is introduced, and there are no breaking changes. Finally, the major version will be increased when incompatible changes are introduced in the API.

This means that between versions 2.3.1 and 2.10.4, there are no introduced breaking changes, but only a few added features and bug fixes. However, if we have version 2.10.4 and we want to change any of the already existing public APIs in a backward-incompatible manner (for instance, changing the order of the parameters that a method accepts), we need to increment the major version and reset the patch and minor versions; so we will get version 3.0.0.

The Angular team also follows a strict, predictable schedule. According to it, a new patch version needs to be introduced every week; there should be three monthly minor releases after each major release, and finally, one major release every 6 months. This means that by the end of 2018, there will be Angular 7. However, this doesn't mean that every 6 months we'll have to go through the same migration path like we did between AngularJS and Angular 2. Not every major release will introduce breaking changes that are going to impact our projects. For instance, support for a newer version of TypeScript or change of the last optional argument of a method will be considered as a breaking change. We can think of these breaking changes in a way similar to what happened between AngularJS 1.2 and AngularJS 1.3.

Since the content that you'll read in this book will be mostly relevant across different Angular versions, we'll refer to the framework as only Angular. If somewhere we explicitly mention a version, this doesn't mean that the given paragraph will not be valid for Angular 4 or Angular 5; it most likely will. If a given API is available in only a specific Angular version, this will be clearly noted. In case you're interested to know what the changes are between different versions of the framework, you can take a look at the change log at https://github.com/angular/angular/blob/master/CHANGELOG.md.

Now that we've introduced Angular's semantic versioning and conventions for referring to the different versions of the framework, we can officially start our journey!

Key benefits

• Get up to date with Google’s vision for Angular

• Align with Angular version 5 and beyond from any direction with confidence

• Start using TypeScript to supercharge your Angular applications

• Understand the new framework from AngularJS perspective using your prior experience

• Use Angular to quickly build fast and scalable enterprise applications

Description

Align your work to stable APIs of Angular, version 5 and beyond, with Angular expert Minko Gechev. Angular is the modern Google framework for you to build high-performance, SEO-friendly, and robust web applications. Switching to Angular, Third Edition, shows you how you can align your current and future development with Google's long-term vision for Angular. Gechev shares his expert knowledge and community involvement to give you the clarity you need to confidently switch to Angular and stable APIs. Minko Gechev helps you get to grips with Angular with an overview of the framework, and understand the long-term building blocks of Google's web framework. Gechev then gives you the lowdown on TypeScript with a crash course, so you can take advantage of Angular in its native, statically typed environment. You'll next move on to see how to use Angular dependency injection, plus how Angular router and forms, and Angular pipes, are designed to work for your projects today and in the future. You'll be aligned with the vision and techniques of the one Angular, and be ready to start building quick and efficient Angular applications. You'll know how to take advantage of the latest Angular features and the core, stable APIs you can depend on. You'll be ready to confidently plan your future with the Angular framework.

Who is this book for?

This book is for software developers who want to align with a modern version of Angular that’s aligned with Google’s vision of Angular version 5 and beyond, using stable APIs that they can depend on today and in the future. Also for anyone assessing changes to Angular and squaring up for a strategic migration to Angular v5, and for AngularJS developers who want to transfer their mindset to modern Angular version 5 and beyond.

What you will learn

Align with Google's vision for Angular version 5 and beyond

Confidently move forward with a long-term understanding of Angular

Use stable APIs in Angular to build future-proof, blazingly fast enterprise applications

Work with TypeScript to supercharge your Angular applications

Understand the core concepts of Angular, aligned with the vision from Google

Be ready with Angular from any direction—whether you're building new apps with the Angular and ASP.NET stack, or upgrading from AngularJS with ngUpgrade

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Dimitar B. Feb 21, 2018

Great book for people like me migrating from AngularJS to Angular, and people starting now with Angular. Minko gives great explanation, beeing a part of the angular mobile team and actively contributing to the ecosystem. He is giving an extecive insight of how and why angular is working. The latest version 5. Long term development of an application. How to develop and improve an enterprise level application.

Amazon Verified review

Mark Pieszak Feb 16, 2018

Very well written and packed with insightful information by Minko and from Angular team members, you get an inside-scoop on the how’s and why’s of Angular.If Angular or Typescript seem overwhelming to you when trying to get started with Angular, by the time you read through this book you’ll feel more confident about everything.Minko lays out a great foundation for readers to not only get started with Angular, but to truly have a deeper understanding of -what- they are doing, and how it all fits together.

John Peters Apr 08, 2018

I didn't realize by reading the title that it was targeted for migrating from Angular 1.0 to Angular 5.0. The book, as a result spends a ton of time looking backward. That aspect is just noise to me. I should have read the previews as set my mind on the fact this is about migration. Sure there's good stuff for what's new, but to me it isn't a primer on Angular 5.0 as I expected.

Robert E. Hames Dec 26, 2018

The book is full of bits and pieces, and presumes prior knowledge in some places, and explains simple concepts in others.

TechRanger Apr 22, 2019

Can't really comment on its content, because I received a copy which was printed with extremely light ink rendering most of the book unreadable.

Switching to Angular: Align with Google's long-term vision for Angular version 5 and beyond , Third Edition

What do you get with Print?

Switching to Angular

Switching to the One Angular

Introducing the One Angular

From AngularJS to Angular

The new beginning

Angular and SemVer

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Switching to Angular: Align with Google's long-term vision for Angular version 5 and beyond , Third Edition

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