Angular Interview Questions For Experienced
Top Angular Interview Questions for Experienced Professionals
Angular Interview Questions For Experienced
In an Angular interview for experienced professionals, you can expect to be asked about advanced topics such as performance optimization, NgRx state management, server-side rendering, lazy loading, Angular universal, module and dependency injection customization, RxJS operators, effective error handling strategies, component architecture design patterns, use of TypeScript in Angular projects, and advanced routing techniques. Employers may also inquire about your experience with integrating Angular with other technologies such as Node.js, GraphQL, or Firebase. It is essential to be well-versed in these areas and be able to provide detailed examples from your past projects to showcase your expertise in Angular development.
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1 - What is the difference between AngularJS and Angular?
AngularJS is the first version of the Angular framework, commonly referred to as Angular 1.x. Whereas Angular, also known as Angular 2 and above, is a complete rewrite of AngularJS with improvements in performance, speed, and features like reactive programming using RxJS. Angular has a component based architecture compared to AngularJS's controller based architecture.
2) Explain the concept of lazy loading in Angular.
Lazy loading is a technique used to load only the required modules and components when they are needed, rather than loading the entire application at once. This can significantly improve the initial loading time of the application and reduce the overall size of the bundle, leading to faster performance. Lazy loading is achieved by using Angular's built in feature called loadChildren in the router configuration.
3) How does data binding work in Angular?
Angular supports two types of data binding: one way binding and two way binding. One way binding allows the data to flow from the component class to the template (view). Two way binding allows data to flow in both directions from the component class to the template and vice versa. Angular uses change detection to detect changes in the application state and update the view accordingly.
4) What is AOT compilation in Angular?
AOT (Ahead of Time) compilation is a process in Angular that converts Angular HTML and TypeScript code into efficient JavaScript code during the build phase of the application. This results in faster rendering in the browser as the compilation work is done before the application is deployed to the client's browser. AOT compilation also helps in reducing the bundle size and improving overall performance.
5) Explain the concept of Angular Services and why are they used?
Angular Services are reusable components that encapsulate specific functionality or data that can be shared across multiple parts of an application. Services are used to keep the business logic separate from the components, promoting code reusability, maintainability, and testability. Services are often used to handle data fetching, processing, and other functionalities that are not tied to a specific component.
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