Angular Interview Questions and Answers for Experienced

July 09, 2023

Getting ready for a job interview can be overwhelming, particularly for seasoned Angular developers. Companies are now placing a greater emphasis on finding candidates who possess a deep understanding of Angular and possess problem-solving abilities. To assist you in your preparation, we have curated an extensive collection of frequently asked Angular interview questions. In this blog post, we will supply thorough answers and explanations to equip you with the necessary tools to overcome any hurdles that may arise. Let's delve into the material and explore the critical Angular interview questions for experienced developers.

20 common Angular interview questions:

  1. What is Angular and how does it differ from AngularJS?

Angular is a TypeScript-based open-source web application framework developed by Google. It is a complete rewrite of AngularJS and offers improved performance, modularity, and a more component-driven architecture.

  1. Explain the key features of Angular.

The key features of Angular include two-way data binding, dependency injection, component-based architecture, templating, routing, and powerful CLI (Command Line Interface) tools.

  1. What is a component in Angular?

A component is a basic building block in Angular that combines a template, CSS styles, and TypeScript code to define the behavior and appearance of a part of the user interface.

  1. What is data binding in Angular?

Data binding is a mechanism in Angular that establishes a connection between the component and its view. It allows automatic synchronization of data between the component and the template.

  1. Explain the difference between one-way binding and two-way binding.

One-way binding displays data from the component to the view (template), while two-way binding allows data to flow in both directions, from the component to the view and vice versa.

  1. What are directives in Angular?

Directives are markers on DOM elements that allow you to add behavior or manipulate the DOM. Angular has three types of directives: component, attribute, and structural directives.

  1. What is dependency injection in Angular?

Dependency injection is a design pattern used in Angular that allows the components to obtain the required dependencies from external sources instead of creating them manually. It promotes code reusability and testability.

  1. Explain the Angular module and its purpose.

An Angular module is a container for a set of related components, directives, pipes, and services. It helps organize the application into reusable and cohesive blocks of functionality.

  1. What is the purpose of Angular services?

Angular services are used to share data, logic, or functionality across multiple components. They provide a way to centralize common functionality and promote code reuse.

  1. What is Angular routing and how does it work?

Angular routing enables navigation between different components or views based on the browser URL. It uses the Angular Router module and allows developers to create Single Page Applications (SPAs) with multiple views.

  1. What are Angular pipes?

Angular pipes are a feature that allows transforming and formatting data within the template. They can be used for tasks like data formatting, filtering, sorting, and more.

  1. What is Angular CLI? How does it simplify Angular development?

Angular CLI (Command Line Interface) is a powerful tool that automates various development tasks such as creating new projects, generating components, services, and modules, running tests, and optimizing the production build. It streamlines the development process and improves productivity.

  1. How does Angular handle forms and form validation?

Angular provides built-in form handling and validation mechanisms through the FormsModule and ReactiveFormsModule modules. Developers can use form controls, validators, and form submission events to implement form functionality and validation.

  1. Explain the concept of lazy loading in Angular.

Lazy loading is a technique used to load modules or components only when they are needed, rather than loading the entire application upfront. It helps improve initial load times and optimize performance.

  1. What is Angular's Ahead-of-Time (AOT) compilation?

AOT compilation is a build process in Angular that converts the application's templates and TypeScript code into efficient JavaScript code during the build phase. It improves performance by reducing the runtime compilation overhead.

  1. How does change detection work in Angular?

Angular's change detection mechanism is responsible for detecting and updating the view whenever there is a change in the component's data or state. It uses a hierarchical tree structure to efficiently track changes and update the DOM.

  1. What is Angular Universal?

Angular Universal is a server-side rendering (SSR) solution provided by Angular. It allows rendering Angular applications on the server, delivering faster initial page loads, improved SEO, and better user experience.

  1. How can you optimize the performance of an Angular application?

Performance optimization techniques in Angular include lazy loading, AOT compilation, code minification and bundling, using production builds, implementing change detection strategies (OnPush), optimizing API calls, and reducing unnecessary re-rendering of components.

  1. What is Angular testing and how can you write unit tests in Angular?

Angular provides a robust testing framework for writing unit tests, integration tests, and end-to-end tests. Unit tests in Angular are written using testing utilities like TestBed, which allows testing individual components, services, and pipes in isolation.

  1. How do you handle error handling and HTTP requests in Angular?

Angular provides the HttpClient module for making HTTP requests. Error handling can be done using RxJS operators like catchError and retry. Interceptors can also be used to globally handle HTTP errors and modify requests or responses.

Good luck with your Angular interviews!

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