Angular 9 Interview Questions

Web Design And Development

Angular 9 Interview Questions

Top Angular 9 Interview Questions to Help You Prepare

Angular 9 Interview Questions

Sure! In an Angular 9 interview, you can expect questions related to the new features introduced in Angular 9, such as the updated Ivy rendering engine, differential loading for faster apps, improved build times, better debugging capabilities, and enhanced performance. Interviewers may also inquire about your experience with RxJS, Angular Forms, Angular CLI, lazy loading, Angular Universal for server-side rendering, Angular routing, and best practices for optimizing Angular applications. Additionally, be prepared to discuss your knowledge of TypeScript, dependency injection, services, components, directives, pipes, and working with Observables. Familiarity with testing frameworks like Jasmine and Karma, as well as Angular Material for UI components, may also be tested.

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1 - What are some key features of Angular 9?

Angular 9 introduced several features, such as improved compiler performance, updated dependencies for better support and stability, enhanced language service for better type checking, and the Ivy rendering engine as default. Ivy brings size reductions in generated code, improved build times, and increased performance. Additionally, Angular 9 supports TypeScript 3.7 and RxJS 6.5, providing new capabilities and improved developer experience.

2) Explain the concept of Ivy rendering engine in Angular 9.

The Ivy rendering engine is a new internal architecture in Angular 9 that is focused on improving performance, reducing bundle sizes, and enhancing developer experience. It is designed to offer benefits like faster rebuilds, better debugging and type checking, improved template type checking, and more predictable and maintainable code.

3) How does Ahead of Time compilation benefit Angular applications in version 9?

Ahead of Time (AOT) compilation in Angular 9 offers advantages like improved performance, smaller bundle sizes, elimination of runtime compilation during application startup, and increased security by detecting template errors at build time rather than runtime. AOT compilation can lead to faster rendering and loading times, making Angular applications more efficient and user friendly. 

4) What is differential loading in Angular 9, and how does it contribute to performance optimization?

Differential loading in Angular 9 is a technique that generates separate bundles for modern and legacy browsers. By serving optimized bundles based on the browser's capabilities, Angular applications can load faster and perform better on all devices. This approach ensures that modern browsers receive fewer polyfills and smaller code bundles, while older browsers still get the necessary support for running the application. Differential loading ultimately enhances performance and user experience across a wide range of browsers.

5) How has the Angular CLI evolved in version 9, and what are some of the new features available?

Angular 9 updates the Angular CLI to provide support for configuring Ivy as the default rendering engine, allowing developers to easily switch between View Engine and Ivy. The CLI also offers enhanced performance and optimization features for builds and testing, simplifying the development process and improving productivity. Additionally, Angular 9 CLI introduces new commands and options for generating components, services, and modules, enabling developers to create scalable and maintainable applications more efficiently.

These are some of the key aspects to consider when preparing for an Angular 9 interview.


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