Angular Questions For Interview
Top Angular Interview Questions
Angular Questions For Interview
In an Angular interview, you can expect questions related to the fundamentals of Angular, such as components, modules, services, data binding, directives, pipes, and dependency injection. Additionally, you may be asked about router configurations, forms handling, HTTP client usage, and state management with tools like RxJS and NgRx. Employers may also inquire about your knowledge of performance optimization techniques, debugging skills, and familiarity with testing frameworks like Jasmine and Karma. It's important to showcase your practical experience by discussing projects you've worked on, challenges you've faced, and how you overcame them using Angular best practices.
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1 - What is Angular and how is it different from AngularJS?
Angular is a web application framework developed and maintained by Google. It is a complete rewrite of the original AngularJS framework, focusing on creating single page applications with a more modular and efficient structure. Angular uses TypeScript as its primary language, supports reactive programming with RxJS, and utilizes a component based architecture for building applications.
2) Explain the key features of Angular.
Angular offers several key features that make it a popular choice for developing web applications. These features include two way data binding, dependency injection, directives for building reusable components, services for encapsulating business logic, and routing for creating multiple views in a single page application. Additionally, Angular provides tools for unit testing, internationalization, and accessibility compliance.
3) What is TypeScript and why is it used in Angular?
TypeScript is a superset of JavaScript that adds static typing and other features to the language. It helps catch errors during development and provides better tooling support for large codebases. Angular is built using TypeScript because it offers better code organization, scalability, and maintainability compared to plain JavaScript. TypeScript also enables developers to use modern ES6+ features while ensuring backward compatibility with older browsers.
4) How does Angular handle data binding?
Angular uses a technique called two way data binding, which synchronizes the data between the model and the view in real time. When data in the model changes, the view is automatically updated to reflect those changes, and vice versa. This simplifies the development process and reduces the amount of boilerplate code needed to keep the UI in sync with the underlying data model.
5) Explain the concept of Dependency Injection in Angular.
Dependency Injection (DI) is a design pattern used in Angular to manage dependencies between different components of an application. By injecting dependencies into a component instead of creating them inside the component, Angular allows for better separation of concerns and easier testing. DI makes it possible to create loosely coupled components that can be easily replaced or updated without impacting other parts of the application.
6) What are Angular directives and how are they used?
Angular directives are markers on a DOM element that tell Angular's HTML compiler to attach a specified behavior to that element. Directives can be used to create custom HTML elements, attributes, classes, or comments that extend the functionality of standard HTML. They are a powerful feature of Angular for building reusable components, adding interactivity to the UI, and enhancing the structure of web applications.
7) How does Angular handle routing and navigation?
Angular provides a built in router module that allows developers to define navigation paths and map them to specific components. By defining routes in the application configuration, Angular can load different components based on the URL, enable deep linking, and implement nested views within a single page application. The Angular router also supports lazy loading of modules to improve performance by loading components only when needed.
8) Explain the concept of Angular services and why are they important.
Angular services are singleton objects that encapsulate reusable business logic and data manipulation functions. They are used to share data and functionality across components, providing a centralized way to manage application state and communicate with external APIs. Services help in keeping the components lean and focused on the presentation layer, while the business logic is abstracted into service classes for better organization and maintainability of the codebase.
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