Angular Developer

10+ Angular Developer Interview Questions and Answers for Freshers

Updated 10 Dec 2024

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Q1. what is services, modules, decorators, directive?

Ans.

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

Q2. Can you explain attributes in Html

Ans.

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 () and 'src' in an image tag ().

Q3. How to transfer data between components

Ans.

Methods to transfer data between components in Angular include Input and Output properties, ViewChild, Services, and Event Emitters.

Using Input and Output properties to pass data from parent to child components and emit events from child to parent components.
Using ViewChild to access child components and their properties directly from the parent component.
Using Services to create a shared service that can be injected into multiple components to share data.
Using Event Emitters...read more

Q4. what are the new features in java 8?

Ans.

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.

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Q5. what is angular? what is SPA?

Ans.

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

Q6. which version of java you use?

Ans.

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.

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Q7. what is DSA ....

Ans.

DSA stands for Data Structures and Algorithms.

DSA is a field of study that focuses on organizing and manipulating data efficiently.
It involves the design and implementation of data structures and algorithms.
DSA is essential for solving complex problems and optimizing software performance.
Examples of data structures include arrays, linked lists, stacks, queues, trees, and graphs.
Examples of algorithms include sorting, searching, graph traversal, and dynamic programming.

Q8. what is lazy loading?

Ans.

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.

Q9. what is multicasting ?

Ans.

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.

Q10. what is rxjs? in deep?

Ans.

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.

Q11. what are pipes in angular

Ans.

Pipes in Angular are used for transforming data in templates.

Pipes are used to format data before displaying it in the view
They can be used to filter, sort, or transform data in various ways
Examples include date pipe, currency pipe, and uppercase/lowercase pipe

Q12. What is RxJS ?

Ans.

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.

Q13. what is switchMap?

Ans.

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)))

Q14. Explain about Flexbox model

Ans.

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;

Q15. difference between ?? and ?:

Ans.

?? 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.