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What is dependency injection in Magento , and how is it implemented?

What is dependency injection in Magento , and how is it implemented?

Answer: Dependency Injection (DI) in Magento is a design pattern used to achieve Inversion of Control (IoC), allowing components to be loosely coupled. Instead of a class creating its dependencies directly, it receives them from an external source, typically a factory or service container.

In Magento, DI is implemented using XML configuration files, PHP constructors, and the service container. Dependencies are defined in `di.xml` files, where you can specify which class should be used for a given type. When a class is instantiated, Magento automatically injects the required dependencies into the constructor, promoting better code reusability and easier testing.

For example, if a class requires a Logger object, it would declare it in its constructor, and the DI system would provide the necessary Logger instance upon instantiation.

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