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This is a favorite for senior roles. You must be able to explain the hierarchical structure of DI and how Angular resolves dependencies through different provider scopes ( root , module , or component level). 2. The Performance "Hack": Change Detection
Demonstrate knowledge of NgZone.runOutsideAngular() . Show how to run performance-heavy computations outside the Angular context, manually re-entering only when a DOM update is strictly required. OnPush Strategy Mastery
Don't just say PreloadAllModules . Explain custom preloading: preload only modules a user is likely to visit based on behaviour (e.g., after login preload dashboard, but not admin panel). decoded frontend angular interview hacking
Angular without RxJS is like a car without wheels. If the interviewer asks about Promises, they are testing to see if you know when not to use them.
Represents the dynamically instantiated component instance, allowing you to manually bind inputs and subscribe to outputs. 5. Network and Bundle Optimization
They track dependencies automatically using a producer-consumer graph. This public link is valid for 7 days
Components are the building blocks of Angular applications. Describe the characteristics of a component, including its template, class, and metadata.
Be ready to describe a strategy for gradually migrating a legacy
@Host() : Stops looking for dependencies once it reaches the host element of the current component. The inject() Function Can’t copy the link right now
Discuss how OnPush change detection works by checking only when input references change or observables fire.
Combine OnPush with async pipe because async calls markForCheck() automatically. Then mention ChangeDetectorRef.detach() for ultra-optimised, manual control (e.g., animations or real-time data streams).
DI is a design pattern where a class requests dependencies from external sources rather than creating them itself. Angular's DI system makes code more modular, testable, and maintainable. Q: How do you handle events in templates?