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Software Engineering vocabulary · Architecture, Design Patterns and Graphics

Dependency injection

Meaning in software engineering, with examples

nounAdvanced term

In software engineering, dependency injection means: A technique where an object receives the things it needs, such as a database client, from outside instead of creating them itself, which makes code easier to test.

In Turkish: bağımlılık enjeksiyonu, bağımlılıkların dışarıdan verilmesi

How it is used

Often shortened to DI. Frameworks such as Spring, ASP.NET Core and Angular have built-in DI containers. With dependency injection, tests can pass in a mock instead of the real service. You inject a dependency, often through the constructor.

Example sentences

  1. Thanks to dependency injection, the tests use a fake payment client instead of the real one.

  2. Don't create the logger inside the class; use dependency injection and pass it in.

Common collocations

  • DI container
  • constructor injection
  • inject a dependency
  • use dependency injection
  • dependencyA library, service or other piece of software that your code needs in order to work, so a change or failure in it can affect your project.
  • mockA fake version of a real object or service used in tests, so you can control its behavior and check how your code uses it. Also a verb: to mock a service.
  • loose couplingA design in which the parts of a system depend on each other as little as possible, so a change in one part rarely forces changes in the others.
  • design patternA proven, reusable solution to a common design problem in code, such as Singleton, Factory or Observer, described as a general approach rather than finished code.

More terms: Architecture, Design Patterns and Graphics

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