Angular2 Interview Question
Top Angular 2 Interview Questions and Answers
Angular2 Interview Question
In an Angular 2 interview, you can expect questions related to the fundamental concepts of Angular 2 such as components, services, modules, data binding, directives, pipes, dependency injection, routing, and observables. Employers may also ask about TypeScript, as Angular 2 is built using TypeScript. JavaScript fundamentals, RESTful API concepts, and testing with Angular 2 (using tools like Jasmine and Karma) could also be part of the interview. It's important to demonstrate your understanding of these key concepts and showcase your practical experience with Angular 2 through projects and examples.
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1 - What is Angular 2?
Angular 2 is an open source web application framework developed by Google. It is a complete rewrite of the original AngularJS framework, focusing on providing a more modern and efficient way to build web applications.
2) What are the key features of Angular 2?
Some key features of Angular 2 include improved performance, better support for mobile development, a more modular design through the use of components, enhanced dependency injection, and a more streamlined syntax.
3) How does Angular 2 differ from AngularJS?
Angular 2 differs from AngularJS in several ways, including the shift from controllers and scope to components, improved performance through the use of a more streamlined rendering pipeline, and a more modular architecture that allows for better code organization and reusability.
4) What is the role of components in Angular 2?
Components are the building blocks of Angular 2 applications and are used to encapsulate the behavior and presentation of different parts of an application. They promote reusability and maintainability by breaking down the user interface into smaller, self contained pieces.
5) What is Angular CLI?
Angular CLI is a command line interface tool that helps developers create, scaffold, build, and maintain Angular applications more efficiently. It provides a set of commands for tasks such as generating components, services, and modules, as well as serving and building the application.
6) What is TypeScript and why is it used in Angular 2?
TypeScript is a superset of JavaScript that adds optional static typing and other features to help developers write more maintainable and scalable code. Angular 2 is built using TypeScript, which brings benefits such as improved code organization, better tooling support, and enhanced error checking.
7) What is Angular Module?
An Angular module is a container for different parts of an Angular application, such as components, services, directives, and pipes. Modules help in organizing the code, managing dependencies, and enabling lazy loading of features.
8) What is data binding in Angular 2?
Data binding in Angular 2 allows for the synchronization of data between the component and the view. There are different types of data binding available, including interpolation, property binding, event binding, and two way binding, which simplify the process of updating the user interface based on changes in the data model.
9) How does dependency injection work in Angular 2?
Dependency injection in Angular 2 is a design pattern that allows components to receive their dependencies from an external source, such as a module or a service. This promotes code reusability, testability, and modularity by decoupling components from their dependencies.
10) What is routing in Angular 2?
Routing in Angular 2 enables navigation between different parts of an application by defining routes and corresponding components to be displayed. It facilitates the creation of single page applications (SPAs) with multiple views and allows for deep linking and route guarding to control access to certain parts of the application.
11) What are Angular services?
Angular services are singleton objects that are used to encapsulate business logic, data access, or other shared functionality that can be used across different parts of an application. They promote code reusability and maintainability by providing a common way to share data and behavior among components.
12) How is server side communication handled in Angular 2?
In Angular 2, server side communication is typically handled using the HttpClient module, which provides a simplified API for making HTTP requests and handling responses. Developers can use observables and RxJS operators to manage asynchronous data streams, perform CRUD operations, and handle errors more efficiently.
13) What are directives in Angular 2?
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Directives in Angular 2 are markers on a DOM element that tell Angular to attach a specific behavior to that element or transform it in some way. There are different types of directives, including structural directives like ngIf and ngFor, and attribute directives like ngStyle and ngClass, which allow developers to extend HTML syntax and build dynamic, interactive UI components.
14) How does change detection work in Angular 2?
Change detection in Angular 2 is the process by which Angular keeps track of changes in the application's data model and updates the view accordingly. Angular uses a unidirectional data flow and a Zone.js library to trigger change detection cycles efficiently, ensuring that the UI stays in sync with the underlying data.
15) What are Angular pipes?
Angular pipes are used to transform data in a template before displaying it to the user. They allow developers to format dates, numbers, strings, and other types of data in a consistent and reusable way. Angular provides several built in pipes, such as date, currency, and uppercase, as well as the ability to create custom pipes for specific formatting needs.
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