The component only checks for changes when an @Input reference changes, an event originates from the component, or an async pipe emits.
System design interviews for frontend developers focus on how you structure applications to scale without turning into a maintenance nightmare. Component Architecture
Candidates often prepare using Angular 12 or 13 concepts. They talk about ngModule extensively and don't mention Signals. This signals to the interviewer that your knowledge is stale. decoded frontend angular interview hacking
"Do you use change detection by default, or do you rely on the default strategy?"
You must be able to explain why we use switchMap over mergeMap or concatMap . Interviewers love to present a scenario involving a search bar; "hacking" this answer means mentioning debounceTime , distinctUntilChanged , and the automatic cancellation of previous requests with switchMap . The component only checks for changes when an
Leo opened DevTools. He ignored the Console tab. Instead, he clicked -> Page -> main.js . He hit {} to pretty-print. 18,000 lines of compiled Angular. He searched for WebSocket .
Over-triggering renders in high-frequency event scenarios (like scrolling or mouse moves). They talk about ngModule extensively and don't mention
: A standard search bar causes too many API calls and lacks state management.