ReactJS Technical Questions – codewindow.n

/*! elementor – v3.16.0 – 14-09-2023 */
.elementor-column .elementor-spacer-inner{height:var(–spacer-size)}.e-con{–container-widget-width:100%}.e-con-inner>.elementor-widget-spacer,.e-con>.elementor-widget-spacer{width:var(–container-widget-width,var(–spacer-size));–align-self:var(–container-widget-align-self,initial);–flex-shrink:0}.e-con-inner>.elementor-widget-spacer>.elementor-widget-container,.e-con>.elementor-widget-spacer>.elementor-widget-container{height:100%;width:100%}.e-con-inner>.elementor-widget-spacer>.elementor-widget-container>.elementor-spacer,.e-con>.elementor-widget-spacer>.elementor-widget-container>.elementor-spacer{height:100%}.e-con-inner>.elementor-widget-spacer>.elementor-widget-container>.elementor-spacer>.elementor-spacer-inner,.e-con>.elementor-widget-spacer>.elementor-widget-container>.elementor-spacer>.elementor-spacer-inner{height:var(–container-widget-height,var(–spacer-size))}.e-con-inner>.elementor-widget-spacer.elementor-widget-empty,.e-con>.elementor-widget-spacer.elementor-widget-empty{position:relative;min-height:22px;min-width:22px}.e-con-inner>.elementor-widget-spacer.elementor-widget-empty .elementor-widget-empty-icon,.e-con>.elementor-widget-spacer.elementor-widget-empty .elementor-widget-empty-icon{position:absolute;top:0;bottom:0;left:0;right:0;margin:auto;padding:0;width:22px;height:22px}
/*! elementor – v3.16.0 – 14-09-2023 */
.elementor-heading-title{padding:0;margin:0;line-height:1}.elementor-widget-heading .elementor-heading-title[class*=elementor-size-]>a{color:inherit;font-size:inherit;line-height:inherit}.elementor-widget-heading .elementor-heading-title.elementor-size-small{font-size:15px}.elementor-widget-heading .elementor-heading-title.elementor-size-medium{font-size:19px}.elementor-widget-heading .elementor-heading-title.elementor-size-large{font-size:29px}.elementor-widget-heading .elementor-heading-title.elementor-size-xl{font-size:39px}.elementor-widget-heading .elementor-heading-title.elementor-size-xxl{font-size:59px}

Related Topics

/*! elementor – v3.16.0 – 14-09-2023 */
.elementor-widget-divider{–divider-border-style:none;–divider-border-width:1px;–divider-color:#0c0d0e;–divider-icon-size:20px;–divider-element-spacing:10px;–divider-pattern-height:24px;–divider-pattern-size:20px;–divider-pattern-url:none;–divider-pattern-repeat:repeat-x}.elementor-widget-divider .elementor-divider{display:flex}.elementor-widget-divider .elementor-divider__text{font-size:15px;line-height:1;max-width:95%}.elementor-widget-divider .elementor-divider__element{margin:0 var(–divider-element-spacing);flex-shrink:0}.elementor-widget-divider .elementor-icon{font-size:var(–divider-icon-size)}.elementor-widget-divider .elementor-divider-separator{display:flex;margin:0;direction:ltr}.elementor-widget-divider–view-line_icon .elementor-divider-separator,.elementor-widget-divider–view-line_text .elementor-divider-separator{align-items:center}.elementor-widget-divider–view-line_icon .elementor-divider-separator:after,.elementor-widget-divider–view-line_icon .elementor-divider-separator:before,.elementor-widget-divider–view-line_text .elementor-divider-separator:after,.elementor-widget-divider–view-line_text .elementor-divider-separator:before{display:block;content:””;border-bottom:0;flex-grow:1;border-top:var(–divider-border-width) var(–divider-border-style) var(–divider-color)}.elementor-widget-divider–element-align-left .elementor-divider .elementor-divider-separator>.elementor-divider__svg:first-of-type{flex-grow:0;flex-shrink:100}.elementor-widget-divider–element-align-left .elementor-divider-separator:before{content:none}.elementor-widget-divider–element-align-left .elementor-divider__element{margin-left:0}.elementor-widget-divider–element-align-right .elementor-divider .elementor-divider-separator>.elementor-divider__svg:last-of-type{flex-grow:0;flex-shrink:100}.elementor-widget-divider–element-align-right .elementor-divider-separator:after{content:none}.elementor-widget-divider–element-align-right .elementor-divider__element{margin-right:0}.elementor-widget-divider:not(.elementor-widget-divider–view-line_text):not(.elementor-widget-divider–view-line_icon) .elementor-divider-separator{border-top:var(–divider-border-width) var(–divider-border-style) var(–divider-color)}.elementor-widget-divider–separator-type-pattern{–divider-border-style:none}.elementor-widget-divider–separator-type-pattern.elementor-widget-divider–view-line .elementor-divider-separator,.elementor-widget-divider–separator-type-pattern:not(.elementor-widget-divider–view-line) .elementor-divider-separator:after,.elementor-widget-divider–separator-type-pattern:not(.elementor-widget-divider–view-line) .elementor-divider-separator:before,.elementor-widget-divider–separator-type-pattern:not([class*=elementor-widget-divider–view]) .elementor-divider-separator{width:100%;min-height:var(–divider-pattern-height);-webkit-mask-size:var(–divider-pattern-size) 100%;mask-size:var(–divider-pattern-size) 100%;-webkit-mask-repeat:var(–divider-pattern-repeat);mask-repeat:var(–divider-pattern-repeat);background-color:var(–divider-color);-webkit-mask-image:var(–divider-pattern-url);mask-image:var(–divider-pattern-url)}.elementor-widget-divider–no-spacing{–divider-pattern-size:auto}.elementor-widget-divider–bg-round{–divider-pattern-repeat:round}.rtl .elementor-widget-divider .elementor-divider__text{direction:rtl}.e-con-inner>.elementor-widget-divider,.e-con>.elementor-widget-divider{width:var(–container-widget-width,100%);–flex-grow:var(–container-widget-flex-grow)}
/*! elementor – v3.16.0 – 14-09-2023 */
.elementor-widget-image{text-align:center}.elementor-widget-image a{display:inline-block}.elementor-widget-image a img[src$=”.svg”]{width:48px}.elementor-widget-image img{vertical-align:middle;display:inline-block}

ReactJS – Questions

Introduction

Codewindow

1. What is React and why is it important in front-end development?

2. What are the main differences between React and other JavaScript frameworks and libraries?

3. What is the virtual DOM and how does it improve performance in React?

4. Explain how components and props work in React?

5. What is state and how is it managed in React?

6. How does React handle updates and re-rendering of components?

7. What are the lifecycle methods of a React component?

8. What is the role of JSX in React and how does it make writing components easier?

9. What is the purpose of the React Router library and how is it used?

10. How to handle data management and API calls in React?

11. What are Higher-Order Components and how are they used in React?

12. How does React handle performance optimization and updates to the virtual DOM?

13. Discuss the concept of server-side rendering in React?

14. How does React handle cross-browser compatibility issues?

15. What is Redux and how does it integrate with React?

Components in React.js

Codewindow

16. What is a React component and how is it different from a plain JavaScript function or class?

17. How to create a stateless or stateful component in React?

18. Explain the difference between props and state in React?

19. How to pass data from a parent component to a child component in React?

20. How to manage component state and lifecycle methods in React?

21. Explain the use of key prop in React components?

22. How to handle events in React components?

23. Explain the concept of Virtual DOM in React and its benefits?

24. What are Higher-Order Components in React and how to use them?

25. How to debug React components in the browser?

26. Explain how React uses the concept of immutability to improve performance?

27. How to use conditional rendering in React components?

Virtual DOM in React.js

Codewindow

28. Explain what the Virtual DOM is in React.js and why it’s used?

29. How does React’s Virtual DOM improve performance compared to manipulating the actual DOM directly?

30. Give an example of how React updates the Virtual DOM?

31. How does React determine which components in the Virtual DOM need to be updated?

32. Explain the difference between the Virtual DOM and the Real DOM?

33. Explain how React’s Virtual DOM helps improve SEO?

34. How does React’s Virtual DOM make it easier to debug and test applications?

35. Explain how React’s Virtual DOM optimizes updates and renders in a fast and efficient manner?

36. How does React use the Virtual DOM to handle state changes in an application?

37. How does React use the Virtual DOM to handle state changes in an application?

State and Props in React.js

Codewindow

38. What is the difference between state and props in React.js?

39. How to update the state in React.js and what is the use case for it?

40. What is the significance of props in React.js and how are they passed down to child components?

41. Explain the concept of immutability in the context of state and props in React.js?

42. How does React.js handle updates to its components when the state or props change?

43. Give an example of when you would use state in your React.js application and when you would use props?

44. How does the use of state and props affect the performance of a React.js application?

45. Discuss the concept of “lifting state up” in React.js and why it is important?

46. What are some best practices for managing the state in a React.js application?

47. How to ensure that state updates in a React.js application are performed in a predictable and efficient manner?

React Router

Codewindow

48. What is React Router and how is it used in React applications?

49. What are the different types of routing in React Router (e.g. URL routing, component routing)?

50. How to handle nested routes in React Router?

51. What is the use of the “Switch” component in React Router and when would you use it?

52. Explain the concept of URL parameters in React Router and how to use them in your applications?

53. What is the difference between the use of the “Link” and “NavLink” components in React Router?

54. How to handle redirects in React Router and what is the purpose of the “Redirect” component?

55. Explain the process of programmatic navigation in React Router and how it is used in your applications?

56. What are the security concerns when using React Router and how can they be addressed?

57. How to dynamically update the URL in React Router based on user actions or other events in your application?

React Hooks

Codewindow

58. Explain what React Hooks are and how they differ from HOCs and render props?

59. How to use the useState hook in a React component?

60. Example of how to use the use Effect hook to manage side effects in a React component?

61. Explain the difference between use Effect and use Layout Effect?

62. How to implement a custom hook in React?

63. Explain the use of the use Context hook in React?

64. How to manage the value of a controlled form input using the useState and useEffect hooks in React?

65. Give an example of how you would implement the useReducer hook in React?

66. Explain the use of the useRef hook in React?

67. Explain the difference between useRef and useState in React?

Redux in React.js

Codewindow

68. What is Redux and why is it used in React.js?

69. What is the difference between state and props in React and how does Redux handle state management?

70. Explain the concept of “state management” in React and how Redux helps with it?

71. How does the Redux store, actions, and reducers work together in a React application?

72. What are some common use cases for using Redux in a React application?

73. Give an example of how to handle asynchronous actions in a Redux store?

74. How does Redux handle data normalization in a React application?

75. What are the benefits of using Redux middleware in a React application?

76. How to debug a Redux store in a React application?

77. Explain the concept of “reselect” library in Redux and when to use it?

78. How to handle updating the Redux store when your React components re-render?

Context API in React.js

Codewindow

79. Explain what the Context API is and how it differs from Redux in React?

80. How to used the Context API in your projects?

81. How to implement data sharing between multiple components using the Context API?

82. Give an example of when it would be appropriate to use the Context API over Redux in React?

83. Discuss the use of the Provider and Consumer components in the Context API?

84. Have you worked with any other state management libraries in combination with the Context API?

85. How to handle data updates in the Context API and ensure consistency across your application?

86. Discuss any performance considerations or limitations when using the Context API in a React app?

87. How the Context API can be used for global theme management in a React app?

React with Webpack and Babel

Codewindow

88. What is Web pack and what is its role in React development?

89. Explain the relationship between React and Babel in the development process?

90. How to configure and optimize Webpack for a React project?

91. Example of how to integrate Babel with Webpack for React?

92. How to manage and load different assets (such as images, fonts, and styles) in a React project with Webpack?

93. How to use environment variables in a React project with Webpack and Babel?

94. Explain the difference between development and production builds with Webpack in a React project?

95. How to implement hot reloading in a React project using Web pack?

96. How to handle code splitting and lazy loading in a React project with Web pack?

Testing in React.js

Codewindow

97. What is the purpose of testing in React and why is it important?

98. How to approach testing in a React application?

99. What are the different types of tests you can perform in React, such as unit tests, integration tests, and end-to-end tests?

100. What testing libraries do you use in React and why?

101. How to set up testing environment in a React project?

102. How to write and run tests in a React application?

103. Example of testing a complex React component and explain the thought process behind it?

104. How to ensure that your React components are testable and maintainable over time?

105. How to measure the coverage of your tests and make sure that your tests are comprehensive enough?

Deployment and Optimization in React.js

Codewindow

106. How to handle the deployment process for a React.js application?

107. What strategies do you use to optimize the performance of a React.js application?

108. How to ensure the scalability of a React.js application?

109. What is your approach to debugging React.js applications?

110. How to handle updates to a deployed React.js application?

111. Discuss your experience with hosting and scaling React.js applications?

112. How to ensure the security of a React.js application?

113. Discuss your experience with version control for React.js applications?

114. How to handle browser compatibility issues with React.js applications?

Emerging Trends and Best Practices in React.js

Codewindow

115. What are some of the latest updates in React.js and how have they changed the way you work with the framework?

116. Explain the concept of React Hooks and how they differ from class-based components?

117. How to manage state in your React applications, and what are some best practices for doing so effectively?

118. How to approach testing React components, and what tools do you use for testing and debugging?

119. What are some of the key considerations for optimizing and deploying React applications, and how do you ensure they are scalable and performant?

120. How to stay up-to-date with the latest trends and best practices in React development, and what resources do you find most useful?

121. Difference between server-side and client-side rendering in React and when to use each?

Top Company Questions

Learn More

Automata Fixing And More

Learn More

      

Click here For Latest Job Openings

/*! elementor – v3.16.0 – 14-09-2023 */
.elementor-widget-social-icons.elementor-grid-0 .elementor-widget-container,.elementor-widget-social-icons.elementor-grid-mobile-0 .elementor-widget-container,.elementor-widget-social-icons.elementor-grid-tablet-0 .elementor-widget-container{line-height:1;font-size:0}.elementor-widget-social-icons:not(.elementor-grid-0):not(.elementor-grid-tablet-0):not(.elementor-grid-mobile-0) .elementor-grid{display:inline-grid}.elementor-widget-social-icons .elementor-grid{grid-column-gap:var(–grid-column-gap,5px);grid-row-gap:var(–grid-row-gap,5px);grid-template-columns:var(–grid-template-columns);justify-content:var(–justify-content,center);justify-items:var(–justify-content,center)}.elementor-icon.elementor-social-icon{font-size:var(–icon-size,25px);line-height:var(–icon-size,25px);width:calc(var(–icon-size, 25px) + (2 * var(–icon-padding, .5em)));height:calc(var(–icon-size, 25px) + (2 * var(–icon-padding, .5em)))}.elementor-social-icon{–e-social-icon-icon-color:#fff;display:inline-flex;background-color:#69727d;align-items:center;justify-content:center;text-align:center;cursor:pointer}.elementor-social-icon i{color:var(–e-social-icon-icon-color)}.elementor-social-icon svg{fill:var(–e-social-icon-icon-color)}.elementor-social-icon:last-child{margin:0}.elementor-social-icon:hover{opacity:.9;color:#fff}.elementor-social-icon-android{background-color:#a4c639}.elementor-social-icon-apple{background-color:#999}.elementor-social-icon-behance{background-color:#1769ff}.elementor-social-icon-bitbucket{background-color:#205081}.elementor-social-icon-codepen{background-color:#000}.elementor-social-icon-delicious{background-color:#39f}.elementor-social-icon-deviantart{background-color:#05cc47}.elementor-social-icon-digg{background-color:#005be2}.elementor-social-icon-dribbble{background-color:#ea4c89}.elementor-social-icon-elementor{background-color:#d30c5c}.elementor-social-icon-envelope{background-color:#ea4335}.elementor-social-icon-facebook,.elementor-social-icon-facebook-f{background-color:#3b5998}.elementor-social-icon-flickr{background-color:#0063dc}.elementor-social-icon-foursquare{background-color:#2d5be3}.elementor-social-icon-free-code-camp,.elementor-social-icon-freecodecamp{background-color:#006400}.elementor-social-icon-github{background-color:#333}.elementor-social-icon-gitlab{background-color:#e24329}.elementor-social-icon-globe{background-color:#69727d}.elementor-social-icon-google-plus,.elementor-social-icon-google-plus-g{background-color:#dd4b39}.elementor-social-icon-houzz{background-color:#7ac142}.elementor-social-icon-instagram{background-color:#262626}.elementor-social-icon-jsfiddle{background-color:#487aa2}.elementor-social-icon-link{background-color:#818a91}.elementor-social-icon-linkedin,.elementor-social-icon-linkedin-in{background-color:#0077b5}.elementor-social-icon-medium{background-color:#00ab6b}.elementor-social-icon-meetup{background-color:#ec1c40}.elementor-social-icon-mixcloud{background-color:#273a4b}.elementor-social-icon-odnoklassniki{background-color:#f4731c}.elementor-social-icon-pinterest{background-color:#bd081c}.elementor-social-icon-product-hunt{background-color:#da552f}.elementor-social-icon-reddit{background-color:#ff4500}.elementor-social-icon-rss{background-color:#f26522}.elementor-social-icon-shopping-cart{background-color:#4caf50}.elementor-social-icon-skype{background-color:#00aff0}.elementor-social-icon-slideshare{background-color:#0077b5}.elementor-social-icon-snapchat{background-color:#fffc00}.elementor-social-icon-soundcloud{background-color:#f80}.elementor-social-icon-spotify{background-color:#2ebd59}.elementor-social-icon-stack-overflow{background-color:#fe7a15}.elementor-social-icon-steam{background-color:#00adee}.elementor-social-icon-stumbleupon{background-color:#eb4924}.elementor-social-icon-telegram{background-color:#2ca5e0}.elementor-social-icon-thumb-tack{background-color:#1aa1d8}.elementor-social-icon-tripadvisor{background-color:#589442}.elementor-social-icon-tumblr{background-color:#35465c}.elementor-social-icon-twitch{background-color:#6441a5}.elementor-social-icon-twitter{background-color:#1da1f2}.elementor-social-icon-viber{background-color:#665cac}.elementor-social-icon-vimeo{background-color:#1ab7ea}.elementor-social-icon-vk{background-color:#45668e}.elementor-social-icon-weibo{background-color:#dd2430}.elementor-social-icon-weixin{background-color:#31a918}.elementor-social-icon-whatsapp{background-color:#25d366}.elementor-social-icon-wordpress{background-color:#21759b}.elementor-social-icon-xing{background-color:#026466}.elementor-social-icon-yelp{background-color:#af0606}.elementor-social-icon-youtube{background-color:#cd201f}.elementor-social-icon-500px{background-color:#0099e5}.elementor-shape-rounded .elementor-icon.elementor-social-icon{border-radius:10%}.elementor-shape-circle .elementor-icon.elementor-social-icon{border-radius:50%}

Telegram


Facebook


Linkedin


Instagram

Click to Join:

Join Telegram


Study Material


Join Facebook


Join LinkedIn

Popular Category

Topics for You

We Love to Support you

Go through our study material. Your Job is awaiting.

Study Material