Dependency Injection

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Provide dependencies externally, inversion of control. Instead of a class creating its own dependencies, they are passed in from outside (constructor, setter, or interface injection). Enables testability, flexibility, and adherence to the Dependency Inversion Principle.

Key Properties

• Constructor Injection
• IoC Containers
• Service Locator vs DI

Related

• Dependency Inversion Principle (the principle DI implements)
• Singleton (DI replaces singletons)

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design-patterns modern dependency-injection