
Dependency injection is a common component in both AngularJS and Angular, but there are some key differences between the two frameworks in how it actually works.

| AngularJS | Angular |
| --- | --- |
| Dependency injection tokens are always strings | Tokens can have different types. They are often classes and sometimes can be strings. |
| There is exactly one injector even though it is a multi-module applications | There is a tree hierarchy of injectors, with a root injector and an additional injector for each component. |

What are the differences between AngularJS and Angular with respect to dependency injection?

Angular is a TypeScript-based open-source front-end platform that makes it easy to build applications with in web/mobile/desktop.

What is Angular Framework?

Modules are logical boundaries in your application and the application is divided into separate modules to separate the functionality of your application.

What is a Angular module?

What are the steps to use animation module?

Learn about ngcc, the Angular Compatibility Compiler, and how it allows you to use existing libraries in Angular Ivy projects.

What is ngcc in Angular Ivy and why is it important?

Polyfills are a tool for Angular developers, allowing them to use new features of JavaScript without worrying about compatibility with older browsers.

How to use polyfills in Angular application?

How do you manually register locale data?

The ngIf and hidden properties in Angular control element visibility in different ways.

AngularJS	Angular
Dependency injection tokens are always strings	Tokens can have different types. They are often classes and sometimes can be strings.
There is exactly one injector even though it is a multi-module applications	There is a tree hierarchy of injectors, with a root injector and an additional injector for each component.