ANGULAR INTERVIEW QUESTIONS
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ANGULAR ?INTERVIEW? QUESTIONS
Angular is a robust front-end JavaScript framework that is widely used for app development. With the increased popularity, there is a high demand for Angular developers. This article on Angular Interview Questions will present some commonly asked questions and how to answer them. Angular interview questions typically cover a range of topics such as Angular basics, components, services, routing, forms, observables, and advanced concepts like lazy loading, dependency injection, authentication, and testing. Employers often ask about the differences between Angular versions, the lifecycle hooks of components, HTTP request handling, and popular libraries such as RxJS. Candidates may also be required to explain their experience in solving common Angular challenges, optimizing performance, handling state management, and working with third-party APIs. It is essential for candidates to have a strong understanding of core concepts and be able to demonstrate their problem-solving skills during the interview.
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1 - What is Angular and how is it different from AngularJS?
Angular is a TypeScript based open source web application framework developed by Google. Angular is a complete rewrite from AngularJS and offers benefits like improved performance, better tooling support, and a more modular architecture compared to AngularJS.
2) Explain the difference between NgModule and Component in Angular.
NgModule is a decorator function that takes a metadata object, while Component is a decorator function that marks a class as an Angular component and provides configuration metadata. Modules are used to organize the application into cohesive blocks of functionality, while components represent the UI elements of the application.
3) What is a service in Angular and why is it used?
A service is a class that encapsulates a specific functionality or feature and can be injected into components or other services. Services are used in Angular to promote reusability, maintainability, and separation of concerns by moving business logic and data manipulation out of components.
4) What are Angular directives and give an example.
Directives in Angular are markers on a DOM element that tell Angular to attach a specified behavior to that DOM element or transform the DOM element and its children. An example of a directive is ngIf, which conditionally displays an element based on a given expression.
5) Explain the concept of data binding in Angular.
Data binding in Angular is the synchronization of data between the model (component) and the view (template). There are different types of data binding in Angular, including interpolation ({{ }}), property binding ([ ]), event binding (( )), and two way binding using ngModel.
6) What is dependency injection in Angular and why is it important?
Dependency injection is a design pattern in which a class receives its dependencies from external sources rather than creating them itself. In Angular, the framework provides dependencies to a class at runtime, making the class more modular, testable, and easier to maintain.
7) How can you handle errors in Angular applications?
Errors in Angular applications can be handled using try catch blocks, the catchError operator in RxJS for handling HTTP errors, global error handling by implementing the ErrorHandler interface, or using third party error tracking services like Sentry or Rollbar.
8) What is lazy loading in Angular and why is it used?
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Lazy loading is a design pattern in which modules or components are loaded only when required, reducing the initial bundle size and improving the application's loading performance. In Angular, lazy loading is achieved by using load Children in the route configuration to load modules asynchronously.
9. What is Angular CLI and what are its benefits?
Angular CLI (Command Line Interface) is a tool used to create, develop, and maintain Angular applications. It simplifies tasks such as creating new projects, generating components, services, and other elements, running tests, and building applications for deployment. It promotes best practices and standardizes the development workflow.
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