Explain why switchMap (cancel pending requests) and not mergeMap (will cause race conditions).
Without trackBy , any change to the array (even adding one item) causes all DOM elements to be recreated. With trackBy , Angular tracks by unique ID and only updates the changed item. decoded frontend angular interview hacking
: Change the appearance or behavior of an existing element (e.g., ngClass , ngStyle ). 2. Modern Angular Hacking (V14+) Explain why switchMap (cancel pending requests) and not
// Example of clean Signals usage export class CounterComponent count = signal(0); doubleCount = computed(() => this.count() * 2); constructor() effect(() => console.log(`Current double count: $this.doubleCount()`)); increment() this.count.update(c => c + 1); Use code with caution. 3. Dependency Injection (DI) and View Mechanics : Change the appearance or behavior of an
@Optional() : Prevents Angular from throwing an error if a dependency isn't found, returning null instead.
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Then he waited. The iframe loaded—because his interview session was already authenticated via the corporate VPN token. The browser's same-origin policy didn't apply across the iframe's internal domain, but the token did.