What are the difference between angular 2 and 4?

Here are a few significant differences between Angular 2 and 4 which developers are going to notice.

• Angular 4 has many inbuilt animation packages which were missing in Angular 2.
• Angular 4 has its template tag called “ng-template.” The previous version uses only “template.”
• Compared to Angular 2, in the newest version, developers can use else syntax with Nglf for excellent UI handling.
• A new template syntax addition “as keyword” in Angular 4 which can be used to simplify to the “let” syntax.
• Simplified “HTTP request” and application testing in Angular 4.