Common Jobs
React
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1. How does React determine whether to re-render a component in response to state changes?
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2. In which of the following directory React Components are saved?
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3. JSX elements must be wrapped in an enclosing tag.What is this concept known as?
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4. Which feature of React allows it to efficiently update the UI?
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5. Which of the following is correct about prop in react?
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6. JSX is processed into...
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7. A functional component in React is...
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8. Which of the following is method is not a part of ReactDOM?
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9. What is React primarily used for?
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10. What does the setState() function do in a class component?
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11. What is the primary purpose of props in React?
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12. Which of the following is true about React components?
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13. Which of the following acts as the input of a class-based component?
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14. What will be the output of this code snippet?class MyComponent extends React.Component {constructor(props) {super(props);this.state = { count: 1 };} render() {return
{this.state.count}
; } }
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15. In which lifecycle method should you make API calls in a class component?
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16. Identify the error in the following JSX:
<div>Hello World</div><div>Welcome</div>
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17. React.js is written in which of the following language?
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18. Which of the following is a correct way to comment in JSX?
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19. What is the issue in this component definition?
function MyComponent(props) { return <h1>{props.title}</h1>; }
Â
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20. Consider this code snippet:
<div><MyComponent /></div>Â
What does MyComponent represent here?
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21. How are state and props different in React?
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22. What is the correct syntax for embedding a JavaScript expression in JSX?
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23. JSX stands for...
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24. In JSX, how do you express JavaScript variables?
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25. Which lifecycle method is called right before a component is unmounted from the DOM?
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26. What is React.js?
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27. What is the correct order of lifecycle phases in a React class component?
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28. What are Props in React?
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29. Which of the following command is used to Install create-react-app?
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30. Which of the following is a correct way to define a component's initial state in a class component?
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31. What does the following JSX code render?
{'Hello' + 'World'}
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32. How many elements can a valid react component return?
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33. In React, what is the role of a key prop in a list of elements?
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34. What will be displayed on the screen for the following JSX code:<div>{2 * 5}</div>
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35. What is the primary use of the componentDidUpdate method in a class component?
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36. Which of the following is used to pass data to a component from outside in React?
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37. In which condition is the React.js Lifecycle method staticgetDerivedSateFromProps(props, state) is called?
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