Easy Interview Preview (50 questions)
JS
150
React
50
React Hooks
56
RSC
45
Next.js
43
Angular
50
AngularJS
44
HTML5
37
CSS
54
Git
46
GraphQL
73
Node.js
45
TypeScript
38
Vue.js
48
RxJS
40
Redux
49
Remix
38
Java
150
Java 8
72
Java 11
49
Java 17
47
Java 21
53
Java 25
53
jQuery
53
SQL
105
Spring
66
Reactor
38
Docker
69
Redis
66
MongoDB
129
MySQL
53
OWASP
73
PWA
39
Kafka
60
PostgreSQL
50
Unit Testing
37
WebSockets
31
Web Security
35
Jest
122
JUnit
67
Mockito
61
TDD & BDD
80
Test Levels
72
Claude Code
Coming Soon
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React Basics
What is React?
↑ Back to topWhat are the advantages and disadvantages of React?
↑ Back to topWhat distinguishes React from Angular?
↑ Back to topVirtual DOM
What is the Virtual DOM?
↑ Back to topWhat is the difference between the DOM and the Virtual DOM?
↑ Back to topJSX and Props
What is JSX?
↑ Back to topWhat are props used for?
↑ Back to top
What is the difference between state and props?
↑ Back to top
What is prop drilling?
↑ Back to topHow do you enforce typing for props?
↑ Back to top
How do you check if only one child component was passed in props?
↑ Back to top
React API
What Is React Context Used For?
↑ Back to topWhat Is the Role of Keys in React?
↑ Back to topWhat Is the Purpose of refs in React?
↑ Back to topWhat Is ReactDOM?
↑ Back to topWhat Is the Purpose of the render() Function?
↑ Back to top
React Hooks
What Are Hooks Used For?
↑ Back to topWhat Are the Benefits of Using Hooks?
↑ Back to topHow to Skip the Invocation of useEffect?
↑ Back to top
How to Invoke the useEffect Hook Only Once?
↑ Back to top
How to Memoize Computations Using Hooks?
↑ Back to topHow to Create "Heavy" Objects Using Hooks?
↑ Back to topComponents
What is the Difference Between Functional and Class Components?
↑ Back to topControlled vs. Uncontrolled Components
↑ Back to topWhat are Higher Order Components?
↑ Back to topWhat is the Purpose of React.memo()?
↑ Back to top
What is PureComponent?
↑ Back to top
What Are Error Boundaries?
↑ Back to topWhat Lifecycle Methods Do You Know?
↑ Back to topHow Do You Execute an Action Only Once During Rendering?
↑ Back to topIs the setState() Method Synchronous or Asynchronous?
↑ Back to top
Why Should You Not Modify this.state Directly?
↑ Back to top
What Is the Purpose of the Function Passed to setState()?
↑ Back to top
Presentational vs Container Components
↑ Back to topWhat is the Purpose of the StrictMode Component?
↑ Back to top
Events
What is the difference between events in React and HTML?
↑ Back to topWhat is a SyntheticEvent?
↑ Back to topReact Router
What is the purpose of React Router?
↑ Back to topWhat types of <Router> components are available?
↑ Back to top
What is the difference between <BrowserRouter> and <HashRouter>?
↑ Back to top
How can routing be triggered programmatically?
↑ Back to topHow to Handle a Missing Page (404 Status) in React Router?
↑ Back to topHow to Handle Redirection in React Router?
↑ Back to topHow to Split Code Based on the URL?
↑ Back to topReact Redux
What is Redux?
↑ Back to topWhat are the components of Redux?
↑ Back to topWhat are the benefits of using Redux?
↑ Back to topWhat is Redux Thunk used for?
↑ Back to topWhat is Redux Saga used for?
↑ Back to topPerformance
What Would You Do If the Application Renders Too Slowly?
↑ Back to top
Explore all question sets
JS
150
React
50
React Hooks
56
RSC
45
Next.js
43
Angular
50
AngularJS
44
HTML5
37
CSS
54
Git
46
GraphQL
73
Node.js
45
TypeScript
38
Vue.js
48
RxJS
40
Redux
49
Remix
38
Java
150
Java 8
72
Java 11
49
Java 17
47
Java 21
53
Java 25
53
jQuery
53
SQL
105
Spring
66
Reactor
38
Docker
69
Redis
66
MongoDB
129
MySQL
53
OWASP
73
PWA
39
Kafka
60
PostgreSQL
50
Unit Testing
37
WebSockets
31
Web Security
35
Jest
122
JUnit
67
Mockito
61
TDD & BDD
80
Test Levels
72
Claude Code
Coming Soon