Q1. How does dependency injection work in Angular?
Dependency injection supplies instances to classes instead of letting them construct collaborators. Providers are registered at the root (providedIn: 'root'), on a route,...
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Q2. What is the difference between ViewChild and ContentChild?
Both are query decorators, but they search different places. @ViewChild queries the component's own template, while @ContentChild queries content projected into the compo...
Q3. How do Observables differ from Promises, and how do you avoid subscription leaks?
A Promise represents a single future value and is eager: it starts when created, cannot be cancelled, and has no operators beyond then and catch. An Observable is lazy, e...
Q4. When should you use the OnPush change detection strategy?
With the default strategy Angular checks a component on every change-detection run triggered by any event, timer or XHR inside the zone. ChangeDetectionStrategy.OnPush te...
Q5. What are Angular signals and how do they change reactivity?
Signals are Angular's fine-grained reactive primitive. A signal(0) holds a value; reading it with count() registers the consumer as a dependency, and writing with count.s...
Q6. What is the difference between standalone components and NgModules?
Traditional Angular organises components, directives and pipes into NgModules that declare what belongs together and import other modules. Standalone components skip that...
Q7. What is the order of Angular lifecycle hooks?
Angular calls lifecycle hooks in a defined order. The constructor runs first and should only inject dependencies. Then ngOnChanges fires whenever a bound input changes, b...
Q8. What are the different types of data binding in Angular?
Angular has several binding forms. Interpolation {{ value }} renders a component property into text. Property binding [property]="expr" sets a DOM property or directive i...
Q9. How do Angular route guards and lazy loading work together?
The router supports guards that run during navigation: CanActivate, CanActivateChild, CanDeactivate for unsaved forms, CanMatch for feature flags, and Resolve to prefetch...
Q10. How does zone.js drive change detection and what changes with zoneless Angular?
Historically Angular relied on zone.js, which monkey-patches async APIs such as setTimeout, promises, XHR and event listeners so the framework knows when something might ...