Angular Interview Questions | Infosys Interview
Angular Interview Questions | Infosys
Interview
Ace your Angular interview. This video covers Angular interview questions and answers for freshers and experienced candidates. Learn about services, directives, dependency injection, lifecycle hooks, RxJS, and more. We'll cover everything from basic to advanced and scenario-based questions to help you clear Angular interview.
Key topics covered include:
• Angular Lifecycle Hooks 0:00-1:21 : Explanation of `ngOnChanges`, `ngOnInit`, `ngAfterViewInit`, `ngDoCheck`, and `ngOnDestroy`.
• Content Projection (`ng-content`) 1:23-1:46 :How to project content from parent to child components.
• Decorators (1:49-2:33): Discussion of `@Input` and `@Output` decorators for data transfer between components, and `@Component` for defining components.
• Forms (Template-driven vs. Reactive Forms) (2:42-4:12): Differences between template and reactive forms, modules required for reactive forms, and validation using `FormBuilder` and validators.
• State Management (NGX Store) (4:15-6:05): Explanation of NGX store, including states, reducers, actions, selectors, and effects for managing application data.
• Data Transfer Between Components (6:11-7:13): Various methods such as `@Input`, `@Output`, `ViewChild`, `ViewChildren`, shared services, and Subjects.
• RxJS Subjects (7:15-7:37): Different types of subjects: `Subject`, `BehaviorSubject`, and `ReplaySubject`.
• `NgModule` Features (7:45-8:38): Role of `imports`, `declarations`, `exports`, and `providers` in `NgModule`.
• Pipes (Pure vs. Impure) (8:41-10:00): Explanation of pure and impure pipes, their differences, and examples like `AsyncPipe` and custom pipes.
• JavaScript Array Methods (`filter`, `find`, `map`, `forEach`) (10:03-10:40, 12:28-12:45, 24:00-24:50): Differences and use cases for `filter`, `find`, `map`, and `forEach`.
• JavaScript Variable Declarations (`var`, `let`, `const`) (11:00-11:50): Scope, re-declaration, re-initialization, and hoisting differences.
• Event Bubbling and Capturing (12:51-13:56): Explanation of event propagation and event delegation.
• Angular CLI and Project Structure (`angular.json`) (14:18-14:52): Purpose of `angular.json` and creating libraries.
• Lazy Loading (15:38-16:12): How lazy loading improves application performance by loading modules on demand.
• Debouncing (16:17-16:32): Application of debouncing in search functionality.
• RxJS Operators (`switchMap`, `mergeMap`, `combineLatest`, `forkJoin`) (16:34-18:15): Differences and use cases for `switchMap`, `mergeMap`, `combineLatest`, and `forkJoin`.
• Promises (`Promise.all`, `Promise.allSettled`) (18:20-19:02): Comparison with RxJS operators and their behavior on success/failure.
• Angular Environments (19:05-20:01): Creating and managing multiple environments in Angular.
• Build Processes (`ng build` vs. `ng build --prod`) (20:06-21:01): Differences between development and production builds.
• Deep Copying in JavaScript (21:07-22:25): Methods for deep copying objects, including `JSON.parse(JSON.stringify())` and custom functions.
• Shallow Copying (`Object.assign`, Spread Operator) (22:20-22:42): Mention of shallow copy methods.
• Array Manipulation (`slice` vs. `splice`) (25:55-26:29): Differences between `slice` and `splice` regarding modification of the original array and adding/removing elements.
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