Angular top most interview question ans


Here are some frequently asked Angular interview questions and answers:

1). What is Angular?

Angular is a TypeScript-based open-source front-end web application platform. It is used for building web applications and Single Page Applications (SPA) using HTML, CSS, and JavaScript.

2). What is the difference between AngularJS and Angular?

AngularJS is the first version of the Angular framework, which uses JavaScript. Angular, on the other hand, uses TypeScript, which is a superset of JavaScript. Angular is more powerful, faster, and more scalable than AngularJS.

3). What is Dependency Injection in Angular?

Dependency Injection (DI) is a design pattern that allows developers to create reusable components that can be injected into other components. DI enables developers to write more modular and scalable code, by reducing the coupling between different components.

4). What is a Service in Angular?

A service is a TypeScript class that provides a specific functionality that can be shared across different components. Services can be used to retrieve and store data, perform calculations, and manage state.

5). What is Routing in Angular?

Routing is a feature in Angular that enables navigation between different views and components in a Single Page Application (SPA). Routing allows developers to define routes, which map specific URLs to specific components, making it easier to manage navigation in a web application.

6). What is Angular CLI?

Angular CLI (Command Line Interface) is a command-line tool that is used to create, develop, and manage Angular applications. It provides developers with a set of pre-configured templates and tools that can be used to scaffold new projects, generate components, services, and modules, and run unit tests.

7). What is Change Detection in Angular?

Change Detection is a mechanism in Angular that detects changes in the data model of an application and updates the view accordingly. It is a core feature of Angular, which helps to keep the view in sync with the data model, and provides better performance by reducing unnecessary updates.


These are some of the most commonly asked Angular interview questions and answers. However, there may be other questions depending on the specific job requirements and level of experience of the candidate.

8).What is the difference between ngOnInit() and ngOnChanges() lifecycle hooks in Angular?

ngOnInit() is a lifecycle hook that is called once after the component has been initialized, while ngOnChanges() is called every time the input properties of a component change.


9).What is a Directive in Angular?

A Directive is a feature of Angular that allows you to attach behavior to an existing element or create a new element with a specific behavior.

10).What is the difference between a Component and a Directive in Angular?
A Component is a type of directive that has its own template, while a Directive is used to modify the behavior of an existing element or create a new element with a specific behavior.

11).What is the difference between One-way and Two-way Data Binding?
One-way Data Binding is a process of binding data from the model (component) to the view (template) or vice versa. 

12).What is Data Binding in Angular?
Data Binding is the process of synchronizing data between the model (component) and the view (template) in an Angular application. It is a powerful feature that makes it easy to create dynamic and responsive applications.



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