Frequently Asked Angular Interview Questions

Here are 10 commonly asked interview questions and answers in Angular :

1. What is Angular and what are its key features?

Angular is a JavaScript framework for building web applications. Its key features include a declarative template syntax, dependency injection, and reactive programming.


2. What is a component in Angular?

A component in Angular is a class that controls a portion of the UI. It consists of a template, which defines the HTML structure, and a component class, which defines the logic and behavior of the component.


3. What is the role of a directive in Angular?

A directive in Angular is a class that adds behavior to an element in the template. There are three types of directives: component directives, structural directives, and attribute directives.


4. What is the difference between a component and a directive in Angular?

A component is a class that controls a portion of the UI and consists of a template and a component class. A directive is a class that adds behavior to an element in the template, and can be either a component directive, structural directive, or attribute directive.


5. What is the role of a service in Angular?

A service in Angular is a class that provides a set of functions that can be used across multiple components. Services are typically used to encapsulate business logic or to interact with external APIs.


6. What is the difference between a service and a module in Angular?

A service is a class that provides a set of functions that can be used across multiple components, while a module is a container for a set of related components and services.


7. How does Angular handle data binding?

Angular uses a two-way data binding model, where changes made in the UI are reflected in the component class and vice versa. This is accomplished using property binding and event binding.


8. What is the role of a router in Angular?

The router in Angular is responsible for navigating between different components and displaying the appropriate component based on the current URL. It also allows for dynamic routing, where the route parameters can be used to display different data.


9. What is reactive programming and how is it used in Angular?

Reactive programming is a programming paradigm that focuses on the use of streams to process data as it becomes available. In Angular, reactive programming is used with the Observable library to handle asynchronous data streams.


10. What is the difference between AngularJS and Angular?

AngularJS is the first version of Angular, released in 2010. Angular is the second version, released in 2016, and includes a number of improvements and new features over AngularJS.


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