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Code & Deliveryphrase · /dɪˈpendənsi ɪnˈdʒekʃən/

dependency injection

In simple English

In software development, dependency injection is a fundamental design pattern that improves code quality and maintainability. Instead of having a class create the objects it needs internally, those objects are passed in from outside, usually through a constructor, method parameter, or property. This approach decouples components, making them easier to test in isolation and allowing you to swap implementations without changing the class code. Dependency injection frameworks like Spring (Java), Angular (JavaScript), and .NET containers automate this process, reducing boilerplate code. You will hear developers discussing whether to use constructor injection, setter injection, or interface-based injection depending on their project needs. This pattern is especially valued in enterprise and backend development where testability and loose coupling are critical.

Understand what dependency injection is, why it matters, and how to implement it in your codebase.

At a glanceCEFR C1
Commonness4/5
Versatility4/5
FormalityCasualFormalFormal
Spoken ↔ WrittenSpokenWrittenBoth
Directness ↔ DiplomaticDirectDiplomaticDirect
RegionUS and UK
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Say it like this

✓We use dependency injection to keep our classes loosely coupled.
✓This component needs dependency injection to be testable.
✓The team decided to leverage dependency injection across the backend.

Real examples

in a standup

"We refactored the payment module to use dependency injection so our unit tests run faster."

in a code review

"Consider dependency injection here instead of hardcoding the database connection inside the class."

in a team meeting

"Our new microservice architecture relies heavily on dependency injection to manage service dependencies."

Don't say this

Handle with care. Often confused with similar patterns like service locator. Do not use as a verb (you do not 'dependency inject' something).

✕We need to dependency injection this module.
✓We need to implement dependency injection for this module.— Dependency injection is a noun pattern, not a verb. You implement or use it, not perform it as an action.
✕I dependency injected the logger into the class.
✓I injected the logger dependency into the class.— The correct verb is inject or use. Dependency injection describes the pattern itself, not the action.
✕Dependency injection is just a way to pass variables.
✓Dependency injection is a design pattern where objects receive their dependencies rather than creating them.— While passing variables is involved, dependency injection is about architectural decoupling, not just parameter passing.

Other forms

noun

dependency injection

"Dependency injection improves code testability and maintainability."

noun

DI

"We use DI throughout our codebase."

verb_phrase

inject a dependency

"You inject the database connection through the constructor."

adjective

dependency-injected (or DI-based)

"Our dependency-injected architecture makes testing much easier."

Often used with

implement dependency injectionUsed when adding the pattern to an existing codebase.
dependency injection containerThe framework or tool that manages dependencies automatically.
dependency injection frameworkSoftware libraries like Spring, Angular, or Autofac.
constructor injectionA specific type of dependency injection via constructor parameters.
setter injectionPassing dependencies through property setters.
loose coupling with dependency injectionCommon phrase explaining the benefit of the pattern.

Similar words

inversion of control (IoC)A broader pattern of which dependency injection is a key example.
constructor injectionA specific implementation method of dependency injection.
service locatorAn alternative pattern, though generally considered less testable than DI.

Opposites

tight couplinghardcoded dependenciesself-contained classes

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Practice

Try it

4 quick exercises

Pick the most natural phrasing

1. Your colleague asks how you will improve the codebase. Which sounds most natural?

Complete the sentence

2. Using _______ makes it easier to test individual components without external dependencies.

Spot the mistake

3. Which sentence uses dependency injection correctly?

Rewrite naturally

4. Rewrite this using dependency injection: 'We want to make our code easier to test by passing objects from outside instead of creating them inside the class.'

Questions

Quick poll

Have you said "dependency injection" in a standup this week?

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