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{
"@context": "https://schema.org",
"@type": "BlogPosting",
"headline": "Angular Interview Guide",
"description": "Technical interview preparation for Angular developer roles: Angular's component architecture, dependency injection, RxJS observables.",
"datePublished": "2026-03-19",
"author": {
"@type": "Organization",
"name": "CodeSwiftr Team"
},
"url": "https://codeswiftr.com/blog/angular-interview-guide"
}
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{
"@context": "https://schema.org",
"@type": "FAQPage",
"mainEntity": [
{
"@type": "Question",
"name": "What Angular topics are most commonly tested in technical interviews?",
"acceptedAnswer": {
"@type": "Answer",
"text": "Angular interview questions focus on: the component lifecycle (ngOnInit, ngOnChanges, ngOnDestroy, and when to use each), change detection strategies (Default vs. OnPush, when OnPush provides performance benefits), Angular's dependency injection system (providers, injection tokens, hierarchical injectors), RxJS operators and patterns (switchMap vs. mergeMap vs. concatMap vs. exhaustMap), lazy loading modules with the Angular Router, reactive forms vs. template-driven forms, and Angular's standalone component model (introduced in Angular 14, now the preferred pattern without NgModule). TypeScript generics and decorators are also expected as foundational Angular knowledge."
}
},
{
"@type": "Question",
"name": "What is the difference between switchMap, mergeMap, concatMap, and exhaustMap in RxJS?",
"acceptedAnswer": {
"@type": "Answer",
"text": "These four operators all map each source emission to an inner Observable but handle concurrency differently. switchMap cancels the previous inner Observable when a new source emission arrives — ideal for search-as-you-type where only the latest search result matters. mergeMap subscribes to all inner Observables concurrently — ideal for parallel operations where order doesn't matter (multiple independent API calls). concatMap queues inner Observables and only subscribes to the next after the previous completes — ideal for ordered operations (file upload sequence). exhaustMap ignores new source emissions while an inner Observable is active — ideal for preventing double-submission of forms. This is one of the most common Angular interview questions."
}
},
{
"@type": "Question",
"name": "How does Angular's dependency injection differ from React or Vue patterns?",
"acceptedAnswer": {
"@type": "Answer",
"text": "Angular has a built-in hierarchical dependency injection system as a first-class framework feature — not a third-party library. Services are registered in providers arrays (at module, component, or root level) and injected through constructor parameters. This is genuine DI with an IoC container, enabling testable, modular code through interface substitution. React uses Context API and hooks (useContext) for dependency sharing but lacks a proper DI container — libraries like tsyringe or InversifyJS add this. Vue 3 has provide/inject but similarly lacks a container with lifecycle management. Angular's DI means services have defined lifetimes (singleton at root vs. per-component instantiation) and testing with TestBed can provide mock services cleanly."
}
},
{
"@type": "Question",
"name": "Should I use NgModules or standalone components for new Angular projects in 2026?",
"acceptedAnswer": {
"@type": "Answer",
"text": "For new projects in 2026, standalone components are the Angular team's recommended approach and are now the default in Angular 17+. Standalone components eliminate NgModules for declaring and importing components — each component directly imports what it needs (other components, directives, pipes). This reduces boilerplate significantly and makes components more self-contained and easier to reason about. The Angular Router, lazy loading, and server-side rendering all support standalone APIs. Existing NgModule-based codebases do not need immediate migration — both approaches are fully supported. In interviews, demonstrating awareness of the migration path from NgModules to standalone (using ng generate with --standalone flag) signals up-to-date knowledge."
}
}
]
}