10+ Angular Developer Interview Questions and Answers for Freshers

Data binding in Angular connects component data to the template, enabling dynamic updates and interaction.

• Types of data binding: One-way binding (from component to view) and two-way binding (between component and view).

• One-way binding example: {{ propertyName }} in the template displays the value of propertyName from the component.

• Two-way binding example: [(ngModel)] allows for two-way data binding between input fields and component properties.

• Event binding: Using (eventName)...read more

Services, modules, decorators, and directives are key concepts in Angular development.

• Services: Reusable code that can be injected into components to provide specific functionality.

• Modules: Containers for different parts of an Angular application, including components, services, and directives.

• Decorators: Functions that modify classes or properties in Angular, used for adding metadata or behavior to components.

• Directives: Extend HTML with custom attributes and elements, allow...read more

Attributes in HTML provide additional information about an element and are defined within the element's start tag.

• Attributes are used to modify the behavior or appearance of an HTML element.

• They are specified within the opening tag of an element using name-value pairs.

• Examples include 'href' in an anchor tag (<a href='https://www.example.com'>) and 'src' in an image tag (<img src='image.jpg'>).

Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods.

• Lambda expressions allow you to write code in a more concise and readable way.

• Functional interfaces provide a way to define interfaces with a single abstract method.

• Streams allow you to process collections of objects in a functional style.

• Default methods allow you to add new methods to interfaces without breaking existing implementations.

Components are the building blocks of Angular applications, encapsulating HTML, CSS, and TypeScript logic.

• Components are defined using the @Component decorator.

• Each component has a template that defines its view, e.g., <h1>{{ title }}</h1>.

• Components can have styles defined in their metadata, e.g., styles: ['h1 { font-weight: normal; }'].

• Components can communicate with each other using Input and Output properties.

• Example of a simple component: @Component({ selector: 'app-hell...read more

I use Java version 8 for Angular development.

• I use Java 8 for its compatibility with Angular frameworks and libraries.

• Java 8 introduced features like lambda expressions and streams which are useful in Angular development.

• Example: I use Java 8 to write backend services for my Angular applications.

Angular is a popular front-end framework for building web applications. SPA stands for Single Page Application.

• Angular is a front-end framework developed by Google for building dynamic web applications.

• It uses TypeScript for building applications with components, services, and modules.

• SPA is a web application that loads a single HTML page and dynamically updates the content as the user interacts with the app.

• SPA provides a more seamless user experience by avoiding full page r...read more

Lazy loading is a technique used in web development to defer loading non-essential resources until they are needed.

• Lazy loading helps improve page load times by only loading necessary resources initially.

• It is commonly used in Angular applications to load modules, components, or routes on demand.

• Lazy loading can be implemented using Angular's loadChildren property in the routing configuration.

Multicasting is the process of sending data from one source to multiple destinations simultaneously.

• In multicasting, a single sender sends data to a group of receivers at the same time.

• It is commonly used in streaming services where one server sends data to multiple clients.

• Multicasting is more efficient than unicasting (one-to-one communication) when sending data to multiple recipients.

RxJS is a library for reactive programming using Observables to handle asynchronous data streams.

• RxJS stands for Reactive Extensions for JavaScript.

• It allows you to work with asynchronous data streams and handle events.

• Operators like map, filter, and mergeMap are used to manipulate and combine streams.

• Subscriptions are used to listen to and react to changes in the data streams.

• Example: Using RxJS to make HTTP requests in Angular applications.

RxJS is a library for reactive programming using Observables to handle asynchronous data streams.

• RxJS stands for Reactive Extensions for JavaScript.

• It allows you to work with asynchronous data streams and events.

• Operators like map, filter, mergeMap, switchMap, etc., can be used to manipulate and combine streams.

• Example: Using RxJS to handle HTTP requests in Angular applications.

switchMap is an operator in RxJS that projects each source value to an Observable which is merged in the output Observable.

• switchMap is used to switch to a new Observable whenever the source Observable emits a new value.

• It cancels the previous Observable subscription when a new value is emitted.

• Example: source$.pipe(switchMap(value => new Observable(value)))

I am motivated by challenges, continuous learning, and the opportunity to create impactful solutions through technology.

• I thrive on solving complex problems, like optimizing application performance in Angular projects.

• Continuous learning keeps me engaged; I regularly explore new Angular features and best practices.

• I find motivation in teamwork, collaborating with colleagues to deliver high-quality software solutions.

• Creating user-friendly applications that enhance user experi...read more

Flexbox is a layout model in CSS that allows for dynamic and responsive design of web pages.

• Flexbox is used to create flexible layouts that can adapt to different screen sizes and orientations.

• It allows for easy alignment and distribution of elements within a container.

• Flexbox properties include display: flex, flex-direction, justify-content, align-items, and flex-grow.

• Example: display: flex; justify-content: center; align-items: center; flex-direction: row;

?? is the nullish coalescing operator, while ? is the optional chaining operator in Angular.

• ?? is used to provide a default value when a variable is null or undefined.

• ? is used to safely access nested properties of an object without causing errors.

• Example: const name = person?.name; // safe access to 'name' property of 'person' object

?? is the nullish coalescing operator, while ? is the optional chaining operator in Angular.

• ?? is used to provide a default value when a variable is null or undefined.

• ? is used to safely access nested properties of an object without causing errors if a property is null or undefined.