Angular Technical Interview Questions
Top Angular Technical Interview Questions
Angular Technical Interview Questions
Angular technical interview questions typically cover a range of topics including the fundamentals of Angular, such as components, directives, services, modules, and dependency injection. Interviewers may ask about data binding, routing, HTTP client, forms handling, and advanced concepts like observables, lazy loading, and universal/isomorphic rendering. Additionally, questions may focus on best practices, performance optimization, error handling, unit testing, and security considerations in Angular applications. It is important for candidates to have a strong understanding of Angular's core concepts and be able to showcase their problem-solving skills and practical experience with the framework.
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1 - What is Angular? Angular is a popular open source front end web application framework developed by Google. Its architecture allows developers to build dynamic and responsive single page applications using TypeScript.
2) Explain the difference between AngularJS and Angular. AngularJS is the first version of the Angular framework, also known as Angular 1.x. Angular, on the other hand, refers to the newer versions starting from Angular 2 onwards. Angular is a complete rewrite of AngularJS and offers improved performance, enhanced features, and better support for modern web development practices.
3) What is TypeScript? TypeScript is a superset of JavaScript that adds static typing to the language. Angular is built using TypeScript, which provides features such as type checking, interfaces, and classes to help developers write more maintainable and scalable code.
4) What is a component in Angular? Components are the building blocks of an Angular application. They are self contained units that combine HTML templates, CSS styles, and TypeScript code to define the UI and behavior of a part of the application. Components can be hierarchical, with parent and child components interacting through data binding and input/output properties.
5) What is data binding in Angular? Data binding in Angular allows the synchronization of data between the component and the view. There are four types of data binding in Angular: Interpolation, Property binding, Event binding, and Two way binding. Interpolation {{ }} binds data from the component to the view, property binding [ ] binds component properties to target element properties, event binding ( ) binds events to methods in the component, and two way binding [( )] combines property binding and event binding for bi directional data flow.
6) What are services in Angular? Services in Angular are singleton objects that are instantiated only once per application and are used to encapsulate reusable business logic, data, or functionality that multiple components can share. Services are typically used for tasks such as making HTTP requests, caching data, or handling user authentication.
7) What is dependency injection in Angular? Dependency injection in Angular is a design pattern used to provide a component with the services or dependencies it needs. Angular's DI system manages the creation and resolution of these dependencies, allowing components to be loosely coupled and easily testable. By injecting services into components, Angular promotes the reusability and maintainability of code.
8) Explain Angular routing. Angular routing allows developers to build single page applications with multiple views or pages that can be navigated to using URLs. The Angular Router module provides functionality for defining routes, configuring route parameters, and navigating between different parts of the application without reloading the entire page. Routing in Angular helps in organizing the application's structure and managing navigation flow efficiently.
9) What are directives in Angular? Directives in Angular are markers placed on DOM elements that instruct Angular's compiler to attach specific behavior or functionality to those elements. There are three types of directives in Angular: Component directives, Structural directives, and Attribute directives. Component directives are used to define custom components. Structural directives are used to change the structure of the DOM, like adding or removing elements. Attribute directives are used to change the behavior or appearance of DOM elements.
10) What is Angular CLI? Angular CLI (Command Line Interface) is a powerful tool used to initialize, develop, scaffold, and maintain Angular applications. It provides a command line interface to automate common development tasks, such as creating components, services, modules, and running development servers. The Angular CLI helps streamline the development process and enforces best practices recommended by the Angular team.
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