Dependency Injection
Dependency Injection (DI) is a software design pattern that implements Inversion of Control (IoC) for resolving dependencies. It involves providing objects (dependencies) to a class from external sources rather than having the class create them internally, promoting loose coupling and testability. This pattern is widely used in object-oriented programming to manage component dependencies and improve code maintainability.
Developers should use Dependency Injection when building modular, testable applications where components need to be decoupled from their dependencies, such as in large-scale enterprise systems or frameworks like Spring or Angular. It is essential for enabling unit testing by allowing mock dependencies to be injected, and it facilitates configuration management and scalability by centralizing dependency resolution.