{"id":3561,"date":"2024-05-10T11:48:52","date_gmt":"2024-05-10T11:48:52","guid":{"rendered":"https:\/\/www.skillvertex.com\/blog\/?p=3561"},"modified":"2024-05-10T11:48:52","modified_gmt":"2024-05-10T11:48:52","slug":"react-js-interview-questions-and-answers","status":"publish","type":"post","link":"https:\/\/www.skillvertex.com\/blog\/react-js-interview-questions-and-answers\/","title":{"rendered":"Top 51 React js Interview Questions And Answers 2024"},"content":{"rendered":"\n
    \n
  1. What Is React?<\/strong><\/li>\n\n\n\n
  2. When Reactjs released?<\/strong><\/li>\n\n\n\n
  3. What Is the current stable version of Reactjs?<\/strong><\/li>\n\n\n\n
  4. What Is the Repository URL of Reactjs?<\/strong><\/li>\n\n\n\n
  5. How Is React different?<\/strong><\/li>\n\n\n\n
  6. Why Reactjs Is used?<\/strong><\/li>\n\n\n\n
  7. What do you mean by Reactjs?<\/strong><\/li>\n\n\n\n
  8. What Are the features of React?<\/strong><\/li>\n\n\n\n
  9. What Are the Advantages of Reactjs?<\/strong><\/li>\n\n\n\n
  10. What Are the limitations of Reactjs?Do you think Reactjs has any limitations? If so, tell a few?<\/strong><\/li>\n\n\n\n
  11. Does Reactjs use HTML?<\/strong><\/li>\n\n\n\n
  12. What Is the life Cycle of Reactjs components?<\/strong><\/li>\n\n\n\n
  13. What Is JSX?<\/strong><\/li>\n\n\n\n
  14. Why can\u2019t browsers read JSX?<\/strong><\/li>\n\n\n\n
  15. What Are the differences in between Real DOM and Virtual DOM?<\/strong><\/li>\n\n\n\n
  16. Is it possible to nest JSX elements into other JSX elements?<\/strong><\/li>\n\n\n\n
  17. What Is a state in Reactjs and how is it used?<\/strong><\/li>\n\n\n\n
  18. What Are the Differentiate between stateful and stateless components?<\/strong><\/li>\n\n\n\n
  19. What Are the purpose of render() in React?<\/strong><\/li>\n\n\n\n
  20. What are Custom Hooks?<\/strong><\/li>\n\n\n\n
  21. What Are the difference between pros and state?<\/strong><\/li>\n\n\n\n
  22. Is it possible to display props on a parent component?<\/strong><\/li>\n\n\n\n
  23. What Is Synthetic event?<\/strong><\/li>\n\n\n\n
  24. What Are the differences between Controlled and Uncontrolled Components?<\/strong><\/li>\n\n\n\n
  25. What Is Higher Order Components (HOC)?<\/strong><\/li>\n\n\n\n
  26. What Is Component in Reactjs?<\/strong><\/li>\n\n\n\n
  27. What Is Controllable Component in Reactjs?<\/strong><\/li>\n\n\n\n
  28. What Is Uncontrollable Component in Reactjs?<\/strong><\/li>\n\n\n\n
  29. What Are Pure Components?<\/strong><\/li>\n\n\n\n
  30. How to update the State of the Component in Reactjs?<\/strong><\/li>\n\n\n\n
  31. What Are the Component Life Cycle methods in Reactjs?<\/strong><\/li>\n\n\n\n
  32. What Are the methods called when Component is created or while inserting it to DOM?<\/strong><\/li>\n\n\n\n
  33. What Are the methods called when State or Props of the Component is changed?<\/strong><\/li>\n\n\n\n
  34. In which lifecycle event do you make AJAX requests and why?<\/strong><\/li>\n\n\n\n
  35. What Is React Router?<\/strong><\/li>\n\n\n\n
  36. Why do we need a Router in Reactjs?<\/strong><\/li>\n\n\n\n
  37. When would you use a Class Component over a Functional Component?<\/strong><\/li>\n\n\n\n
  38. What Is difference between setState and forceUpdate () and findDOMNode () in Reactjs?<\/strong><\/li>\n\n\n\n
  39. How to use Loop in Reactjs?<\/strong><\/li>\n\n\n\n
  40. How to set focus in Reactjs?<\/strong><\/li>\n\n\n\n
  41. What Are the components in Flux architecture?<\/strong><\/li>\n\n\n\n
  42. What Are the popular libraries used for Flux?<\/strong><\/li>\n\n\n\n
  43. What Are refs in React and why are they important?<\/strong><\/li>\n\n\n\n
  44. \u00a0What Are keys in React and why are they important?<\/strong><\/li>\n\n\n\n
  45. What Is React Lifecycle Components?<\/strong><\/li>\n\n\n\n
  46. What are props in React?<\/strong><\/li>\n\n\n\n
  47. Explain React state and props.<\/strong><\/li>\n\n\n\n
  48. \u00a0Explain about types of side effects in React component.<\/strong><\/li>\n\n\n\n
  49. What is prop drilling in React?<\/strong><\/li>\n\n\n\n
  50. \u00a0What is React Hooks?<\/strong><\/li>\n\n\n\n
  51. What are the rules that must be followed while using React Hooks?<\/strong><\/li>\n<\/ol>\n\n\n\n

    React js Interview Questions And Answers<\/h2>\n\n\n\n
      \n
    1. What Is React?<\/strong><\/li>\n<\/ol>\n\n\n\n

      Answer:<\/strong> React is an open-source JavaScript library developed by Facebook for building user interfaces or UI components. It is widely used for creating interactive and dynamic single-page applications.<\/p>\n\n\n\n

      2. When was React.js released?<\/strong><\/p>\n\n\n\n

      Answer:<\/strong> React.js was first released by Facebook in March 2013.<\/p>\n\n\n\n

      3.What Is the current stable version of React.js?<\/strong><\/p>\n\n\n\n

      Answer:<\/strong> The stable version of React.js can change over time. It’s recommended to check the official React website or the GitHub repository for the most up-to-date information on the current stable version.<\/p>\n\n\n\n

      4.What Is the Repository URL of React.js?<\/strong><\/p>\n\n\n\n

      Answer:<\/strong> The official GitHub repository for React.js is https:\/\/github.com\/facebook\/react<\/a>.<\/p>\n\n\n\n

      5. How Is React different?<\/strong><\/p>\n\n\n\n

      Answer:<\/strong> React is different because it utilizes a virtual DOM for efficient updates, employs a component-based architecture for reusability, and introduces JSX, a syntax extension for JavaScript that allows for declarative UI development.<\/p>\n\n\n\n

      6.Why is React.js used?<\/strong><\/p>\n\n\n\n

      Answer:<\/strong> React.js is used for building user interfaces with a focus on creating reusable UI components. It simplifies the process of building and maintaining large-scale applications, providing efficient rendering and a modular development approach.<\/p>\n\n\n\n

      7.What do you mean by React.js?<\/strong><\/p>\n\n\n\n

      Answer:<\/strong> React.js is a JavaScript library for building user interfaces. It enables the creation of dynamic and responsive UIs by efficiently updating the DOM through the use of a virtual DOM.<\/p>\n\n\n\n

      8.What Are the features of React?<\/strong><\/p>\n\n\n\n

      Answer:<\/strong> Key features of React include a virtual DOM for efficient updates, JSX for declarative syntax, component-based architecture for reusability, unidirectional data flow, and the ability to work with both client-side and server-side rendering.<\/p>\n\n\n\n

      9.What Are the Advantages of React.js?<\/strong><\/p>\n\n\n\n

      Answer:<\/strong> Advantages of React.js include improved performance with a virtual DOM, a component-based structure for reusability, strong community support, one-way data binding for predictable updates, and compatibility with other libraries or frameworks.<\/p>\n\n\n\n

      10.What Are the limitations of React.js?<\/strong><\/p>\n\n\n\n

      Answer:<\/strong> React.js has few limitations, such as a steep learning curve for beginners, frequent updates leading to version compatibility issues, and the need for additional libraries for certain functionalities like routing and state management.<\/p>\n\n\n\n

      <\/p>\n","protected":false},"excerpt":{"rendered":"

      React js Interview Questions And Answers Answer: React is an open-source JavaScript library developed by Facebook for building user interfaces or UI components. It is widely used for creating interactive and dynamic single-page applications. 2. When was React.js released? Answer: React.js was first released by Facebook in March 2013. 3.What Is the current stable version … Read more<\/a><\/p>\n","protected":false},"author":4,"featured_media":5419,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[42],"tags":[573],"class_list":["post-3561","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-interview-prep","tag-react-js-interview-questions-and-answers","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-33"],"_links":{"self":[{"href":"https:\/\/www.skillvertex.com\/blog\/wp-json\/wp\/v2\/posts\/3561","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.skillvertex.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.skillvertex.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.skillvertex.com\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.skillvertex.com\/blog\/wp-json\/wp\/v2\/comments?post=3561"}],"version-history":[{"count":3,"href":"https:\/\/www.skillvertex.com\/blog\/wp-json\/wp\/v2\/posts\/3561\/revisions"}],"predecessor-version":[{"id":3567,"href":"https:\/\/www.skillvertex.com\/blog\/wp-json\/wp\/v2\/posts\/3561\/revisions\/3567"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.skillvertex.com\/blog\/wp-json\/wp\/v2\/media\/5419"}],"wp:attachment":[{"href":"https:\/\/www.skillvertex.com\/blog\/wp-json\/wp\/v2\/media?parent=3561"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.skillvertex.com\/blog\/wp-json\/wp\/v2\/categories?post=3561"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.skillvertex.com\/blog\/wp-json\/wp\/v2\/tags?post=3561"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}