Master one-way data flow ( [property] ), two-way binding ( [(ngModel)] ), and event binding (event) . Know your ngOnInit , ngOnChanges , and ngOnDestroy inside and out.
The cleanest way to manage subscriptions. It auto-subscribes in the template and auto-unsubscribes when the component unmounts from the DOM.
Perfect for localized, feature-specific state or medium-sized apps where global boilerplate is counterproductive.
Technical skills alone will not get you a senior offer. You must frame your answers to show you prioritize business value, team scalability, and maintainability.
Most candidates fail the basics because they memorize CLI commands, not concepts. decoded frontend angular interview hacking
You must master the ChangeDetectionStrategy.OnPush optimization. Explain that OnPush skips checking a component subtree unless the component's @Input references change, or an event originates from within that component. This shifts change detection from a heavy operational cost to a highly targeted, predictable path. Lifecycle Hook Execution Order
Disables automatic checking for a component. The component will only re-render if its @Input() reference changes, an event originates from inside the component, or an observable bound via the async pipe emits.
A Component is actually a Directive with a template. Directives add behavior to existing DOM elements; Components create reusable UI views with encapsulated templates and styles.
Never say Signals replace RxJS entirely. Position Signals as the tool for state and template rendering, and RxJS as the tool for asynchronous event coordination. 2. Advanced Change Detection & Performance Tuning Master one-way data flow ( [property] ), two-way
"RxJS has a steep curve, but for async flows like cancellation and retries, it's more powerful than Promises. Modules are still essential for forRoot() patterns and lazy-loading route configurations."
Older versions of Angular SSR destroyed and re-rendered the DOM on the client side, causing noticeable layout shifts. Modern Angular uses full, non-destructive hydration. The client reuses the server-rendered DOM structure and simply attaches event listeners, resulting in a seamless user experience. 5. Cheat Sheet: Code Optimization & Common Anti-Patterns Anti-Pattern The Hack / Solution Why It Matters Use pure pipes or Signals
Most candidates memorize the lifecycle hooks ( ngOnInit , ngOnDestroy ). Hacking the interview means knowing the weird stuff.
@Self() : Tells Angular to look only in the local element injector of the current component. You must frame your answers to show you
An interviewer might present a classic RxJS data-fetching and filtering pattern and ask you to refactor it using Signals to optimize performance. typescript
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Be ready to explain how to render components dynamically without relying on static template declarations.