Basic react js interview questions
Here is the React js interview questions and answers for freshers, experienced professionals.
What are the features of React?
What are the major advantages of React.?
What are the limitations of React?
Please explain step by step approach on how to setup environment for ReactJS?
What is JSX and how JSX can help applications in React.js?
What do you understand by Virtual DOM? Explain its working.
Why can’t browsers read JSX?
How different is React’s ES6 syntax when compared to ES5?
Difference between React different from Angular?
What are Differentiates between Real DOM and Virtual DOM ?
What do you understand from “In React, everything is a component.”
Explain the purpose of render() in React.
How can you embed two or more components into one?
What is Props?
What is a state in React and how is it used?
Differentiate between states and props.
How can you update the state of a component?
What is arrow function in React? How is it used?
Differentiate between stateful and stateless components.
What are the different phases of React component’s lifecycle?
Explain the lifecycle methods of React components in detail.
What is an event in React?
How do you create an event in React?
What are synthetic events in React?
What do you understand by refs in React?
Can you list some of the cases when you should use Refs?
Have you used HTML while working with React.js?
How do you modularize code in React?
How are forms created in React?
What do you know about controlled and uncontrolled components?
What are Higher Order Components(HOC)?
What can you do with HOC?
What are Pure Components?
What is the significance of keys in React?
What were the major problems with MVC framework?
Advanced reactjs interview questions
What is Flux in React.js?
What is Redux in react.js?
What are the three principles that Redux follows?
What do you understand by “Single source of truth”?
List down the components of Redux.
Show how the data flows through Redux?
How are Actions defined in Redux?
Explain the role of Reducer.
What is the significance of Store in Redux?
How is Redux different from Flux?
Why do you use Redux and Flux?
What is React Router?
Why is switch keyword used in React Router v4?
Why do we need a Router in React?
List down the advantages of React Router.
How is React Router different from conventional routing?
What is the difference between setState() and forceUpdate()?
When would you use setState() and forceUpdate()?
Which feature can we use to cause a component to render only when its ID changes?
What kind of tools might you use in the build steps to optimize the compiled output of the React code?
What is the difference between Flux Vs MVC?
What are pure functional Components?
What is high-level component lifecycle in React.js?
What is low-level component lifecycle in React.js?
How to use Events in ReactJS? Give an example of using events?
How to use Forms in ReactJS? Give an example of using Forms in ReactJS by developing a User Registration Form?
How would you create Higher Order Components (HOCs) in React.js?
What is the difference between React Components in ES5 and ES6?
What is shouldComponentUpdate and when is used in React.js?
What is the difference between an Element and a Component in React?
What is the difference between AngularJs Vs React.js?
What is the difference between React Components extend, createClass and mixins, HOCs?
What is the difference between various React Component lifecycle methods?
What is the Virtual DOM, and a pragmatic overview of how React renders it to the DOM in React.js?
How might React handle or restrict Props to certain types, or require certain Props to exist?
What is Flux concept in ReactJS? Explain various flux elements including Action, Dispatcher, Store and View. Give a simple practical example of installing and using Flux in an application?
What is ReactJS-JSX? What are the advantages of using JSX? Explain basic code snippet of JSX with the help of a practical example?