Angular Interview Question And Answer
Comprehensive Guide: Angular Interview Questions and Answers
Angular Interview Question And Answer
During an Angular interview, candidates may be asked various questions to test their knowledge and skills related to the Angular framework. Common topics include Angular features, components, data binding, services, directives, and routing. One popular question could be to explain the difference between ngOnChanges and ngOnInit lifecycle hooks in Angular. A good answer would discuss how ngOnChanges is used to respond to changes in input properties, while ngOnInit is used for initialization tasks when a directive or component is created. Candidates should showcase their understanding of Angular concepts and demonstrate practical examples to support their answers.
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1 - What is Angular and how is it different from AngularJS?
Angular is a TypeScript based open source web application framework developed by Google. It is a complete rewrite of AngularJS, which is an older version of the framework. Angular provides better performance, improved features like lazy loading, and a more modular and component based architecture compared to AngularJS.
2) What are the key features of Angular?
Angular offers features like two way data binding, dependency injection, directives, services, pipes, and a powerful templating engine. It also provides tools for routing, forms handling, HTTP client, animations, and testing capabilities.
3) What is a component in Angular?
A component is a core building block of an Angular application that consists of a TypeScript class, an HTML template, and a CSS style sheet. Components encapsulate the UI and behavior of a part of the application and can be reused across the application.
4) Explain the concept of data binding in Angular.
Data binding in Angular allows synchronization of data between the component and the view. There are four types of data binding: interpolation ({{}}), property binding ([]), event binding (()), and two way binding ([()]).
5) What is Angular CLI?
Angular CLI (Command Line Interface) is a command line tool provided by the Angular team to streamline the development process. It allows developers to generate components, services, modules, pipes, and more within an Angular project, as well as to build, test, and deploy the application easily.
6) What is a service in Angular?
A service is a reusable code that can be shared across different parts of an Angular application. Services are used to encapsulate logic, data retrieval, or any other functionality that multiple components may need.
7) How does dependency injection work in Angular?
Angular's dependency injection system provides objects required by a component instead of the component creating them itself. Dependencies are injected into a component's constructor, making it easier to manage dependencies, promote reusability, and facilitate testing.
8) What is the difference between ngOnInit and constructor in Angular?
The constructor is a TypeScript method of a class that gets called when the class is instantiated, while ngOnInit is an Angular lifecycle hook that is called after the component has been initialized. OnInit is used to perform tasks after the component's data bound properties have been initialized.
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