How Zone.js triggers updates and why the OnPush strategy is essential for high-performance applications.
You will be asked abstract theory. Here is how to "decode" the hidden meaning.
The legacy standard pattern. You maintain a destroy$ subject and trigger it inside ngOnDestroy . The Shift to Angular Signals
Never mutate an @Input object directly. Use the spread operator.
The cleanest approach. It automatically manages subscriptions and unsubscriptions within the template lifecycle. decoded frontend angular interview hacking
Explain that mutating an object property will not trigger an update under OnPush because the object reference remains the same. You must enforce immutability (e.g., using the spread operator or libraries like Immer) to make OnPush work correctly. Signals vs. RxJS
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Angular Interview Questions and Answers | Blog - GreatFrontEnd
Never start coding a feature without clarifying the constraints first. How Zone
Registers the service in the root environment injector. It creates a single, application-wide singleton. Crucially, it allows the service to be tree-shaken —if no component imports the service, compiler tools drop it from the final production bundle.
is designed for asynchronous event streams, coordination, and timing-dependent logic (debouncing, throttling, buffering).
An observable bound in the template via the async pipe emits a new value.
"This dropped unnecessary change detection passes by over 85%, reducing CPU utilization on lower-end devices from 90% down to a stable 12%." The legacy standard pattern
✅ Answer: Use providers array at component level with a token.
"Are you currently leveraging Angular Signals for localized state management, or are you heavily reliant on global state stores like NgRx?"
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