Top 5 React Interview Questions and Prep

Question 1: What are the major features of React?

1. React uses JSX syntax. JSX is a syntax extension of Javascript that allows developers to write HTML in their JS code. JSX stands for Javascript XML.
2. React uses the Virtual DOM instead of Real DOM. Real DOM manipulations are expensive.
3. React supports server-side rendering.
4. React follows unidirectional or one-way data flow or data binding.
5. React uses reusable/composable UI components to develop the view.

Question 2: What is JSX?

JSX stands for Javscript XML. It provides the syntactic sugar for the

React.createElement(type, props, ...children)

It is a syntax extension of JSX. An example, of a variable declaration in JSX is like so.

const element = <h1>Hello, world!</h1>;

Question 3: What is the difference between Element and Component?

A component is a set of elements.

1. An element does not have states or props. They are simply something visual.
2. A component is a function which returns JSX element or element…