How dependency injection works in Angular

Angular's dependency injection (DI) framework, which is integral to building scalable web applications, uses constructor injection to pass dependencies into class constructors. This design pattern, highlighted by Angular's official documentation, decouples service implementation from components, facilitating easier testing and modification. The tutorial provides practical examples of implementing DI in Angular, including creating services and components, and discusses best practices such as using the component's constructor to inject dependencies. It explores application-based and component-based approaches to DI, emphasizing the importance of hierarchical injectors that manage dependencies across the application or component trees. The guide also addresses potential performance drawbacks, like unnecessary service instantiations, and offers solutions to maintain efficiency and flexibility. It concludes by showcasing the benefits of adopting a well-structured DI strategy, which can be monitored and optimized using tools like LogRocket for enhanced debugging and user experience analytics.