React JS Interview Questions & Answers 2020

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React Interview Questions is the perfect guide for you to learn all the concepts required to clear a React interview. But before starting with the React Interview Questions, let’s take a quick look at React’s demand as a UI Developer and also market value being a React JS developer. Currently, in the market of software development, we are having huge demand for React Js, Angular and Vue JS.

1.1 What is React?
1.2 What are the major features of React?
1.3 Type of components in React?
1.4 When to use React Class Component over a Function Component?
1.5 What is the state in React?
1.6 What are the props in React?
1.7 What is the difference between state and props in React?
1.8 Why should we not update the state directly in React?
1.9 What is Virtual DOM in React?
1.10 How Virtual DOM works in React?
1.11 What are controlled components in React?
1.12 What are uncontrolled components in React?
1.13 What are the different phases of the React component lifecycle?
1.14 What are the lifecycle methods of React?
1.15 What are stateless React components?
1.16 What are stateful React components?
1.17 What are the advantages of using React?
1.18 What are the disadvantages of using React?
1.19 What is Redux?
1.20 How data flows through Redux?
1.21 What are the three principles that Redux follows?
1.22 What are the components of Redux?
1.23 What is React Router?