Angular 1 X Interview Questions
Angular 1 Interview Questions for Experienced Developers
Angular 1 X Interview Questions
AngularJS, a JavaScript-based open-source front-end web framework, is highly valued in the tech industry due to its robust features and benefits. In interviews, Angular 1 x questions assess candidates' understanding of its architecture, data binding concepts, dependency injection, routing, and testing methodologies. Proficiency in these areas demonstrates a strong foundation in web development and the ability to build efficient, responsive, and maintainable web applications using Angular 1 x.
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1 - What are the key differences between AngularJS and Angular?
Answer: AngularJS is a full blown framework, while Angular is a set of modular libraries. AngularJS uses two way data binding and a declarative approach, while Angular uses one way data binding and a more imperative approach. AngularJS is more opinionated and has a steeper learning curve, while Angular is more flexible and has a lower learning curve.
2) What are the different types of Angular components?
Answer: Angular components can be classified into three main types: directives, components, and services. Directives are used to extend the HTML syntax and add new behavior to elements. Components are reusable, self contained units of code that can be used to build complex user interfaces. Services are used to provide shared functionality across different components.
3) What is the difference between a component and a directive?
Answer: Components are a more recent addition to the Angular ecosystem and offer several advantages over directives. Components have their own template, CSS, and logic, and can be used to build complex user interfaces. Directives, on the other hand, are used to add new behavior to existing HTML elements.
4) What is the Angular Router and how do you use it?
Answer: The Angular Router is used to manage navigation between different views in an Angular application. To use the Angular Router, you need to first define a set of routes in your application's module file. You can then use the <router outlet> directive to add a placeholder for the current view in your app's template.
5) What is dependency injection and how do you use it in Angular?
Answer: Dependency injection is a technique that allows you to pass dependencies to your components through the constructor. This makes it easy to test your components and ensures that they are not tightly coupled to any particular implementation.
6) What are the different lifecycle hooks in Angular?
Answer: Angular components have a series of lifecycle hooks that allow you to perform different tasks at different stages of their lifecycle. The most common lifecycle hooks are ngOnInit, ngOnChanges, ngDoCheck, ngAfterViewInit, ngAfterContentInit, and ngOnDestroy.
7) What is the change detection strategy in Angular?
Answer: The change detection strategy in Angular is a mechanism that determines how and when the Angular framework checks for changes to the application's state. There are two main change detection strategies: OnPush and Default. OnPush is more efficient, but it requires you to manually check for changes to the component's state. Default is less efficient, but it automatically checks for changes to the component's state.
8) What is the zone.js library?
Answer: Zone.js is a library that is used to intercept and modify JavaScript actions. It is used by Angular to provide features such as change detection, asynchronous programming, and performance profiling.
9) What are the different ways to create a custom directive?
Answer: There are two main ways to create a custom directive: the @Directive decorator and the Component decorator. The @Directive decorator allows you to create a simple directive that modifies the behavior of existing HTML elements. The Component decorator allows you to create a more complex directive that has its own template, CSS, and logic.
10) What is the difference between a service and a factory?
Answer: Services are used to provide shared functionality across different components. Factories are used to create new instances of objects. Services are typically singletons, while factories are not.
11 - What is the Angular CLI?
Answer: The Angular CLI is a command line interface that helps you to create, build, and test Angular applications. The Angular CLI can be used to generate new components, directives, services, and other artifacts. It can also be used to run tests, build the application, and serve the application locally.
12) What is the future of Angular?
Answer: Angular is a popular framework with an active development community. The future of Angular is bright, and there are many exciting new features planned for future releases. Some of these features include improved performance, better tooling, and support for new technologies such as virtual reality and artificial intelligence.
13) What are the performance considerations for Angular applications?
Answer: There are a number of performance considerations that you should keep in mind when developing Angular applications. Some of these considerations include:
Use the OnPush change detection strategy whenever possible.
Avoid using unnecessary change detection triggers.
Use memoization to avoid recalculating values that do not change.
Use lazy loading to load modules only when they are needed.
Use the Angular performance tools to identify and fix performance issues.
14) What are the best practices for Angular development?
Answer: There are a number of best practices that you should follow when developing Angular applications. Some of these best practices include:
Use a consistent coding style.
Use TypeScript to write your code.
Use the Angular CLI to generate new components, directives, and services.
Use the Angular Material library for UI components.
Use the Angular router for navigation.
Use the Angular HTTP client for making HTTP requests.
Use the Angular testing tools to test your code.
Use the Angular performance tools to identify and fix performance issues.
15) What are the resources for learning more about Angular?
Answer: There are a number of resources that you can use to learn more about Angular. Some of these resources include:
The Angular documentation
The Angular tutorial
The Angular blog
The Angular community forum
The Angular books
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- Course Overview
- This course covers essential Angular 1 interview questions and prepares candidates for the technical challenges they may face. It delves into foundational concepts, architecture, testing, performance optimization, and debugging, equipping candidates with the knowledge and skills to confidently tackle angular interview questions.
- Course Description
- Prepare for Angular 1 technical interviews with expert-crafted questions covering core concepts, DOM manipulation, directives, services, routing, and best practices. Enhance your understanding of Angular 1 principles and refine your interview skills through comprehensive practice.
- Key Features
- 1 - Comprehensive Tool Coverage: Provides hands-on training with a range of industry-standard testing tools, including Selenium, JIRA, LoadRunner, and TestRail.
- 2) Practical Exercises: Features real-world exercises and case studies to apply tools in various testing scenarios.
- 3) Interactive Learning: Includes interactive sessions with industry experts for personalized feedback and guidance.
- 4) Detailed Tutorials: Offers extensive tutorials and documentation on tool functionalities and best practices.
- 5) Advanced Techniques: Covers both fundamental and advanced techniques for using testing tools effectively.
- 6) Data Visualization: Integrates tools for visualizing test metrics and results, enhancing data interpretation and decision-making.
- 7) Tool Integration: Teaches how to integrate testing tools into the software development lifecycle for streamlined workflows.
- 8) Project-Based Learning: Focuses on project-based learning to build practical skills and create a portfolio of completed tasks.
- 9) Career Support: Provides resources and support for applying learned skills to real-world job scenarios, including resume building and interview preparation.
- 10) Up-to-Date Content: Ensures that course materials reflect the latest industry standards and tool updates.
Benefits of taking our course
Functional Tools
1 - Angular CLI (Command Line Interface): A command line tool for generating Angular applications and managing their dependencies. It simplifies project setup, code generation, and testing.
2) NgRx State Management: A library that implements the Redux state management pattern in Angular applications. It provides a centralized store for application state, facilitating its management and updates.
3) RxJS Reactive Programming: A library that enables developers to use reactive programming techniques in Angular applications. Reactive programming supports asynchronous event handling and data transformation, enhancing application responsiveness and code readability.
4) Jasmine Testing Framework: A JavaScript testing framework widely used in Angular development. It provides features for writing unit tests, integration tests, and end to end (E2E) tests, ensuring code quality and stability.
5) Karma Test Runner: A test runner that automates the execution of Angular tests. It runs tests in various browsers, providing comprehensive test coverage and identifying potential cross browser issues.
6) Protractor End to End Testing Framework: An E2E testing framework for Angular applications. It allows developers to interact with the application as a real user would, verifying its behavior and functionality across different scenarios.
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