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FREE Building React App Questions and Answers
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About lists in React, why should we use "keys"?
Keys help React identify which items have changed.
The braces interrupt the information listing flow.
The keys are mandatory to prevent the application from stopping.
Keys are not mandatory.
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ReactJS does not need HTML or any of the HTML preprocessor to make UI elements
False
True
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Is the use of JSX mandatory to develop with React?
No
Yes
Sometimes
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Props can be modified in child component directly like state
True
False
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We can integrate reactJS in any of the existing web app
True
False
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About hooks it is incorrect to say:
We can create our own hooks.
Hooks are functions that allow you to hook into React's state and lifecycle features from within functional components.
Hooks don't work inside classes and allow you to use React without classes.
Hooks work inside classes and allow you to use React without classes.
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What is the result of the expression
const [add, setSum] = useState(0)
setSum(add + 4)
setSum(adding - (1x2))
6
4
2
3
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