Top Angular Interview Questions
Best Angular Interview Questions to Prepare for Success
Top Angular Interview Questions
Sure! In Angular interviews, some common questions are related to Angular components, modules, services, data binding, dependency injection, routing, and form handling. Interviewers might ask about the differences between Angular modules and JavaScript modules, how to handle error handling in Angular applications, how to optimize performance in Angular, explain the Angular component lifecycle hooks, and discuss the benefits of using TypeScript with Angular. Employers also might inquire about the various ways to communicate between components in Angular, the importance of lazy loading in Angular routing, and how to test Angular applications using tools like Jasmine and Karma. It's always good to have hands-on experience with real-world Angular projects to demonstrate your understanding of these concepts during interviews.
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1 - What is Angular and why is it preferred over other frameworks? Angular is a popular open source front end framework developed by Google that is widely used for building dynamic web applications. It is preferred over other frameworks due to its features like two way data binding, dependency injection, and modular design which makes development faster and more efficient.
2) Explain the concept of two way data binding in Angular. Two way data binding in Angular allows synchronization of data between the model and the view automatically. When the model data changes, the view is automatically updated, and vice versa. This simplifies the code and reduces the need for manual DOM manipulation.
3) What is Angular CLI and how does it help in Angular development? Angular CLI (Command Line Interface) is a command line tool provided by Angular for creating, building, and managing Angular applications. It helps in setting up the project structure, generating code components, services, modules, and running the development server with just a few commands, which speeds up the development process.
4) Explain Angular modules and their significance in Angular applications. Angular modules are containers for a cohesive block of components, services, directives, pipes, and other code related to a specific feature or functionality. They help in organizing and separating different parts of an application, making it more maintainable, scalable, and testable.
5) How does dependency injection work in Angular? Dependency injection is a design pattern used in Angular to create and manage the dependencies of different components. Angular's injector subsystem injects the dependencies in the components at runtime, allowing for better modularity, reusability, and testability of the code.
6) What are Angular directives and how are they used in Angular applications? Angular directives are markers on a DOM element that tell Angular to attach specific behavior to that element or transform it. Directives can be classified into three types: Component directives, Structural directives, and Attribute directives. They are used to extend HTML functionality, create reusable components, and manipulate the DOM dynamically.
7) Explain the difference between AngularJS and Angular. AngularJS is the first version of Angular, also known as Angular 1.x, which introduced concepts like two way data binding. Angular is the new and improved version of AngularJS, starting from Angular 2 and above. It has a more modular architecture, better performance, improved syntax, and additional features compared to AngularJS.
8) What is RxJS in Angular and how is it used? RxJS (Reactive Extensions for JavaScript) is a library for reactive programming using Observables that makes it easier to compose asynchronous or callback based code. It is extensively used in Angular for handling async operations like HTTP requests, event handling, and data streams in a more functional and reactive way.
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