Angular 2.0 or AngularJS 2.0 is enjoying a rising popularity, with more and more features coming to the core of the application, the Angular team decided to rewrite the original Angular framework and hence officially introduced Angular 2.0 in 2016 to the general public. Most believe that Angular 2 and AngularJS share only many points in common and that it is a migration path (called ng-upgrade) from AngularJS to Angular 2. However, the truth about Angular 2 is entirely different from what most believe it to be, Angular 2.0 is a brand new framework sharing only some concepts of its predecessor.
The entire concept of the application development structure has changed in Angular 2. Previously it was the MVC framework that allowed you to create applications in the pattern of rather tightly coupled entities like controllers, views, services, etc. The whole architecture of AngularJS earlier looked like below:
img – ng1 architecture
But Now, the concept of directives has been pushed further to be closer to the Web Component's standard and React’s way of structuring the application. In Angular 2.0, it is all about components. What it means is that the whole application is now a component, which contains another set of components (routable). To make it end up with a tree-like structure:
img – ng2 architecture
The whole idea of the Angular 2 application architecture is to create components that don’t depend on each other, and which are as loosely coupled to each other as possible.
There are two ways of creating the components:
Smart components: Which know about application state, and can communicate with services to fetch or modify data.
Dumb components: Which should only have inputs and outputs. And are ready to be placed anywhere in the system (or even outside) when providing proper values to the input, and do not know about application state existence.
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