Overview of Dependency Injection

What is dependency injection in Angular?

In an Angular application, we can import and inject dependencies into the components, directives, services, etc. In summary, dependency injection in Angular allows classes to make requests from different components or services to access specific data instead of implementing the logic in one single component.

Merits of dependency injection

1. Maintainability: The design pattern of dependency injection helps create a codebase that’s easy to maintain and makes errors are easy to detect. As the codebase continues to grow, it will be easier to make minor changes instead of starting from scratch.

2. Testability: The design pattern of dependency injection supports separation of concern, making it easy to isolate and debug faults in components, services, or modules.

3. Reusability: Dependency injection makes it easy to reuse services or modules across several components, making the development process faster and of higher quality. The boilerplate code also gets reduced.

4. Modularity: Dependency injection uses a modular approach. It helps reduce coupling between modules and their dependencies, making the codebase easy to read.

Elements of dependency injection

Below, we look at the different elements of dependency injection to better understand what dependency injection is about in ...