Top 50+ React JS MCQ interview questions - McqProf

 ReactJS Multiple Choice Questions for 2023

Here are the list of 50 React JS interview questions with answers I hope this answers are helpful! Study up today and any other questions.


Here are some example React JS interview questions with answers:

  1. What is React and why is it used?
  • React is a JavaScript library for building user interfaces. It is used to create reusable UI components and efficiently update and render those components when data changes.
  1. How does React differ from other JavaScript libraries or frameworks?
  • React is unique in that it only focuses on the view layer of an application, and does not provide a full-featured MVC framework. This allows developers to use React in conjunction with other libraries or frameworks, such as Redux for state management, to build complete applications.
  1. What are the key features of React?
  • Some key features of React include:
    • Components: reusable pieces of code that represent a part of a UI
    • Virtual DOM: a lightweight in-memory representation of the actual DOM, which allows React to efficiently update the real DOM with minimal cost
    • JSX: a syntax extension that allows developers to write HTML-like code in their JavaScript files
    • One-way data flow: data flows in a single direction in a React application, improving the predictability of the application's behavior
  1. How do you pass data to a React component?
  • Data can be passed to a React component using props (short for "properties"). Props are a way of passing data from a parent component to a child component. The child component can then access the props using this.props.
  1. Can you explain the difference between a "controlled component" and an "uncontrolled component" in React?
  • A controlled component is a form element whose value is controlled by the React state. This means that the value of the form element is determined by the value in the component's state, and the value of the form element cannot be changed by the user. An uncontrolled component is a form element whose value is not controlled by the React state. This means that the value of the form element is determined by the defaultValue or value attribute, and the value can be changed by the user.

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