How Well Do You Know Angular Components? A Deep Dive into their Functionality

Angular Components:

• Components in Angular are the basic building blocks of the user interface, representing a part of the application’s view.
• They consist of a TypeScript class, an HTML template, and styles, encapsulating the logic and presentation.

Structure:

• A component is created using the @Component decorator, specifying metadata such as selector, template, style, and more.
• The TypeScript class associated with a component contains the logic, properties, and methods.

Use Case:

• In a blog application, a PostComponent can be created to display individual blog posts with their content, comments, and related information.

Functionality:

• Reusability: Components encourage the development of reusable and self-contained UI elements.
• Encapsulation: Each component is encapsulated, meaning its internal implementation details are hidden from other components, promoting modularity.
• Two-Way Data Binding: Components use two-way data binding to synchronize data between the component class and its template.

// post.component.ts
import { Component, Input } from '@angular/core';

@Component({
  selector: 'app-post',
  templateUrl: './post.component.html',
  styleUrls: ['./post.component.css']
})
export class PostComponent {
  @Input() postTitle: string;
  @Input() postContent: string;
}

//post.component.html
<div class="post">
  <h2>{{ postTitle }}</h2>
  <p>{{ postContent }}</p>
</div>

Interview Questions and Answers:

Q: What is an Angular component?
A: An Angular component is a building block of the user interface, consisting of a TypeScript class, an HTML template, and styles.

Q: How is data passed to a component in Angular?
A: Data is passed to a component using the @Input decorator on properties. The parent component can bind to these properties in the template.

Q: Explain the lifecycle hooks of an Angular component.
A: Angular components have lifecycle hooks like ngOnInit, ngOnChanges, and ngOnDestroy that allow developers to react to changes in the component’s state.

Q: What is the purpose of the selector property in the @Component decorator?
A: The selector property specifies the HTML selector for the component. It is used to embed the component within other templates.

Q: Can a component have multiple templates?
A: No, a component typically has a single template associated with it. However, you can use structural directives like ngIf and ngSwitch to conditionally render different parts of the template.

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