Accenture – React JS Interview Questions
Here is the list React JS Interview Questions which are recently asked in Accenture company. These questions are included for both Freshers and Experienced professionals. Our React JS Training has Answered all the below Questions.
1. What is React?
React is an open-source JavaScript library used for building user interfaces specifically for single-page applications and to be fast, scalable, and simple. It’s used for handling the view layer for web and mobile apps. It also allows us to create reusable UI components.
2. Why React is used?
React helps to manage changing states and dynamically present different views to the user based on state information. React's declarative nature of components makes it easy to get a handle around these complex structures and keep things in check as the application grows in scale and scope.
3. How React works?
React creates a virtual DOM. When state changes in a component it firstly runs a “diffing” algorithm, which identifies what has changed in the virtual DOM. The second step is reconciliation, where it updates the DOM with the results of diff. ReactElements lives in the virtual DOM which is an abstraction of the HTML DOM.
ReactElements can be render into the "real" DOM Once we defined the elements, Whenever a ReactComponent is changing the state, diff algorithm in React runs and identifies what has changed. Then it updates the DOM with the results of diff.
4. What are the features of ReactJS?
The features of React JS are- Virtual DOM, JSX.
- One-way data binding
- React native, Declarative UI
- Component-based architecture
- Speed and efficiency, Flexibility
5. What are the Advantages of React JS?
- Easy to Learn and Use.
- Reusable Components.
- Performance Enhancement.
- The Support of Handy Tools.
- Known to be SEO Friendly.
6. How is React different from AngularJS?
The primary difference between Angular JS and React JS lies in the state of its management. Angular JS has data binding bundled in by default, whereas React is generally augmented by Redux to give unidirectional data flow and work with immutable data. Angular is a full-fledged framework, while React is a library.
7. How ReactJS framework is different as compared to others?
The main feature of React JS is that distinguishes it from other popular JavaScript frameworks is flexibility. We can grab a library and use it to display a simple page or a view, but can also combine React JS with other tools and use it as a framework that will lay the foundation for a complex application
8. Does ReactJS use HTML?
With React, HTML can be written using JavaScript. We rely on the power of JavaScript to generate HTML that depends on some data, rather than enhancing HTML to make it work with that data.
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9. What is JSX?
JSX is an XML/HTML-like syntax used by React that extends ECMA Script so that XML/HTML-like text can co-exist with JavaScript/React code.Unlike the past, instead of putting JavaScript into HTML, JSX allows us to put HTML into JavaScript.
10. What are the life Cycles of ReactJS?
Each component in React has a lifecycle which you can monitor and manipulate during its three main phases. The phases are: initialization, Mounting, Updating, and Unmounting. Every React component goes through the phases.
11. When ReactJS released?
React was created by Jordan Walke, a software engineer at Facebook, who released an early prototype of React called "FaxJS". He was influenced by XHP, an HTML component library for PHP. It was first deployed on Facebook's News Feed in 2011 and later on Instagram in 2012. It was open-sourced at JSConf US in May 2013.
12. How is ReactJs different from AngularJS?
Angular JS is a structural framework for developing dynamic web apps, whereas React is a JavaScript library that allows you to build UI components. Angular JS is based on MVC (Model View Controller) whereas React is based on Virtual DOM. Angular is based on Typescript and React is based on JavaScript.
13. What is Redux?
Redux is a predictable state container for JavaScript applications. It is a state management tool that enables developers to: write applications that behave in a consistent manner.
14. What is Use of Redux thunk?
Redux Thunk middleware allows you to write action creators that return a function instead of an action. The thunk can be used to delay the dispatch of an action, or to dispatch only if a certain condition is met. The inner function receives the store methods dispatch and getState as parameters.
15. What do you know about Flux?
Flux is micro-architecture for software application development, which has unidirectional data flow. It sounds quite abstract but that’s what it is. It is technology agnostic, which means that it doesn't depend on React JS, although it was initially introduced by facebook.
16. What is the current stable version of ReactJS?
React (JavaScript library)
Original author(s) - Jordan Walke
Developer(s) - Facebook and community
Initial release - May 29, 2013
Stable release - 17.0.2 / 22 March 2021
Repository - github.com/facebook/react
17. What is the Repository URL of ReactJS?
The URL of React JS is relatively simple just by accessing the window object. This will give you access to the window 's location object and the value of the URL in it.
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TOP MNC's REACT JS INTERVIEW QUESTIONS & ANSWERS
Here we listed all React JS Interview Questions and Answers which are asked in Top MNCs. Periodically we update this page with recently asked Questions, please do visit our page often and be updated in React JS.
