What is Dependency Injection? — UK Software Development Guide
Direct Answer
Dependency Injection (DI) is a software design pattern where an object receives its dependencies from external code rather than creating them itself. Instead of a class creating its dependencies internally, they are "injected" from outside — typically via the constructor. This makes code more modular, testable, and maintainable.
Dependency-injection in the UK
Dependency Injection is a fundamental practice in UK enterprise software development. Its primary commercial benefit is testability: code that uses DI can be tested with mock or stub dependencies, making unit tests reliable and fast. This is directly relevant to UK quality standards: DTAC Domain 3 (Technical Security) and Cyber Essentials expect robust test coverage; FCA operational resilience requires code that can be tested thoroughly. ClickMasters uses DI in all production code — it is a standard part of our code review checklist.
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