1
What is Angular? Easy
Angular is a TypeScript-based open-source front-end framework developed by Google used to build single-page applications (SPAs) using component-based architecture.
2
What is TypeScript and why Angular uses it? Easy
TypeScript is a superset of JavaScript that adds static typing. Angular uses it for better maintainability, scalability, and tooling support.
3
What is a Component in Angular? Easy
A Component is the basic building block of Angular applications. It controls a part of the UI and consists of a template, class, and metadata.
4
What is NgModule? Easy
NgModule is a container that groups components, directives, pipes, and services into cohesive blocks.
5
What is Data Binding? Easy
Data binding synchronizes data between component and template. Types include interpolation, property binding, event binding, and two-way binding.
6
Explain two-way data binding. Easy
Two-way data binding combines property and event binding using [(ngModel)] syntax.
7
What are Directives? Easy
Directives are classes that add behavior to DOM elements. Types: Structural (*ngIf, *ngFor) and Attribute (ngClass).
8
What is a Service in Angular? Easy
Service is a class used to share data and logic across components.
9
What is Dependency Injection? Easy
Dependency Injection is a design pattern where dependencies are provided to a class instead of creating them inside.
10
What is Angular CLI? Easy
Angular CLI is a command-line tool used to create, build, and manage Angular projects.
11
What is Routing in Angular? Easy
Angular Router enables navigation between different components or views.
12
What is Lazy Loading? Easy
Lazy loading loads modules only when required to improve performance.
13
What are Pipes? Easy
Pipes transform data in templates such as date, uppercase, currency.
14
What is ViewEncapsulation? Easy
ViewEncapsulation controls CSS scope in components (Emulated, None, ShadowDom).
15
Difference between Template-driven and Reactive Forms? Easy
Template-driven forms use ngModel; Reactive forms use FormControl and FormGroup.
16
What is ngOnInit? Easy
ngOnInit is a lifecycle hook that runs after component initialization.
17
What is ngOnDestroy? Easy
ngOnDestroy runs before component destruction, used for cleanup like unsubscribing.
18
What is @Input()? Easy
@Input() decorator passes data from parent to child component.
19
What is @Output()? Easy
@Output() emits events from child to parent component.
20
What is Change Detection? Easy
Angular change detection updates the DOM when data changes.
21
What is OnPush Change Detection? Medium
OnPush strategy checks component only when input reference changes, improving performance.
22
What is RxJS? Medium
RxJS is a reactive programming library used in Angular for handling async data streams.
23
What is Observable? Medium
Observable represents a stream of data over time.
24
Difference between Promise and Observable? Medium
Promise handles single value; Observable handles multiple values and supports cancellation.
25
What is Subject in RxJS? Medium
Subject acts as both Observable and Observer.
26
What is BehaviorSubject? Medium
BehaviorSubject stores the latest emitted value and emits it to new subscribers.
27
What is HTTP Interceptor? Medium
Interceptor intercepts and modifies HTTP requests globally.
28
What are Route Guards? Medium
Guards protect routes like CanActivate, CanDeactivate, CanLoad.
29
What is AOT Compilation? Medium
Ahead-of-Time compilation compiles Angular templates during build time.
30
What is JIT Compilation? Medium
Just-In-Time compilation compiles Angular code in browser at runtime.
31
What is TrackBy in ngFor? Medium
TrackBy improves performance by uniquely identifying list items.
32
What is Content Projection? Medium
Content projection uses to pass content into components.
33
What is Angular Universal? Medium
Angular Universal enables server-side rendering (SSR).
34
What is Zone.js? Medium
Zone.js tracks async operations and triggers change detection.
35
What are Standalone Components? Medium
Standalone components do not require NgModule declaration.
36
What is Angular Signals? Medium
Signals are reactive primitives introduced for state management.
37
What is ViewChild? Medium
ViewChild accesses child components or DOM elements.
38
What is Renderer2? Medium
Renderer2 safely manipulates DOM elements.
39
What are Custom Validators? Medium
Custom validators provide user-defined form validation.
40
What is Resolver? Medium
Resolver fetches data before route activation.
41
What is Dependency Injection Hierarchy? Medium
Angular provides services at root, module, or component level.
42
Explain ngTemplateOutlet. Medium
ngTemplateOutlet dynamically renders templates.
43
What is HttpClient? Medium
HttpClient is Angular service for making HTTP calls.
44
What is Differential Loading? Medium
Serving modern JS to modern browsers for better performance.
45
How to prevent memory leaks? Medium
Unsubscribe observables in ngOnDestroy.
46
How Angular Change Detection works internally? Hard
Angular traverses component tree and checks bindings using Zone.js to detect async changes.
47
What is Ivy Engine? Hard
Ivy is Angular rendering engine introduced in v9 for smaller bundle size and faster builds.
48
What is Tree Shaking? Hard
Tree shaking removes unused code during build process.
49
Explain Angular Compilation Pipeline. Hard
TypeScript → Angular Compiler → AOT → Webpack → Bundle.
50
What is NgRx? Hard
NgRx is Redux-based state management for Angular apps.
51
How to optimize Angular performance? Hard
Use lazy loading, OnPush, trackBy, and code splitting.
52
What are Micro Frontends? Hard
Architecture where large apps are divided into smaller independent apps.
53
What is Module Federation? Hard
Webpack feature to enable micro-frontend architecture.
54
How to secure Angular app? Hard
Use route guards, interceptors, token validation, and CSP policies.
55
What is SSR Hydration? Hard
Reuses server-rendered DOM instead of re-rendering on client.
56
What is ChangeDetectorRef? Hard
Allows manual control over change detection.
57
Explain Angular Architecture. Hard
Angular follows component-based architecture with modular design and reactive programming.
58
How to implement role-based authorization? Hard
Use route guards combined with JWT role validation.
59
What is Ahead-of-Time metadata? Hard
Metadata used by Angular compiler during build time.
60
How Angular DI works internally? Hard
Angular maintains hierarchical injectors that resolve dependencies.
📊 Questions Breakdown
🟢 Easy
20
🟡 Medium
25
🔴 Hard
15
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