Dependency injection in Angular: interview exercises

Dependency injection in Angular: 5 test-checked interview exercises (A service with inject()), each beside a worked example, with tests as you go. Free.

1. A service with inject()
2. InjectionToken with a default
3. One instance per component
4. Swapping an implementation
5. Shared state through the injector tree

Each exercise pairs a worked example with a twin problem to solve in a real editor; the tests run the moment you do. Progress is saved in your browser, and in your account if you sign in.

More Angular topics

• Components & templates
• Signals
• Inputs & outputs
• Pipes & directives
• Forms
• RxJS interop
• HttpClient

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