Interview Questions On Angular
Effective Interview Questions for Assessing Angular Skills
Interview Questions On Angular
In an interview for an Angular developer position, you can expect questions covering topics such as Angular architecture, components, services, directives, modules, dependency injection, data binding, routing, observables, HTTP client, forms, testing, performance optimization, and security best practices. Employers may also ask about your experience with TypeScript, JavaScript, CSS, and HTML, as well as your ability to troubleshoot common Angular issues and your understanding of the latest features in Angular versions. It's important to showcase your problem-solving skills, knowledge of best practices, and familiarity with industry standards during the interview to demonstrate your proficiency in Angular development.
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1 - What is Angular and how is it different from AngularJS?
Angular is a TypeScript based open source framework for building client side web applications. It is a complete rewrite of AngularJS and offers better performance, improved ease of development, and a more streamlined approach to building applications.
2) Explain the concept of data binding in Angular.
Data binding in Angular allows you to establish a connection between the template (HTML) and the component (Typescript code). There are two types of data binding: one way binding (from component to view) and two way binding (both from component to view and vice versa).
3) What are Angular directives and give an example of each type?
Angular directives are markers on a DOM element that tell Angular to do something to that element. There are three types of directives: component directives (create custom HTML tags/components), structural directives (altered the layout by adding or removing elements from the DOM), and attribute directives (change the appearance or behavior of an element).
4) How does dependency injection work in Angular?
Dependency injection in Angular is a design pattern that allows you to pass dependencies (services or objects) into a class at runtime rather than hard coding them. This makes your code more modular, reusable, and testable.
5) What is an Angular service and why is it used?
Angular services are singleton objects that are used to organize and share code across the application. They are commonly used for data sharing, communication with servers, and implementing business logic. Services help keep your components lean and focused on presentation.
6) What are Angular pipes and give an example of how to use them?
Angular pipes are used to transform data before displaying it in the view. Some built in pipes include DatePipe, UpperCasePipe, LowerCasePipe, and CurrencyPipe. For example, you can use the DatePipe to format a date in a specific way before displaying it on the page.
7) How do you handle user inputs in Angular forms?
Angular provides two way data binding and form controls to handle user inputs in forms. You can use reactive forms (formControl and formGroup objects) or template driven forms (ngModel directive) to both validate and collect user input.
8) What is Lazy loading in Angular and why is it important?
Lazy loading is a technique in Angular where you only load the parts of the application that are needed, thus improving the initial load time and performance of the application. This is especially important in large applications with many modules to reduce the initial bundle size and improve user experience.
9) Explain the concept of routing in Angular.
Routing in Angular allows you to navigate between different components and views based on the URL. You can define routes using the RouterModule and Router directives and configure route parameters and guards to control access to certain routes based on conditions. This helps in creating a Single Page Application (SPA) experience.
10) How do you handle HTTP requests in Angular using HttpClient?
You can use Angular's HttpClient module to make HTTP requests to a server to fetch or send data. HttpClient provides methods like get(), post(), put(), delete(), etc., to interact with RESTful APIs. You can also use HttpInterceptor for intercepting and modifying HTTP requests globally in your application.
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