React Hooks

FREE Building React App Questions and Answers

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What is the result of the expression

const [add, setSum] = useState(0)
setSum(add + 4)
setSum(adding - (1x2))

2

3

4

6

Correct! Wrong!

ReactJS does not need HTML or any of the HTML preprocessor to make UI elements

False

True

Correct! Wrong!

Is the use of JSX mandatory to develop with React?

No

Yes

Sometimes

Correct! Wrong!

About lists in React, why should we use "keys"?

The keys are mandatory to prevent the application from stopping.

Keys are not mandatory.

Keys help React identify which items have changed.

The braces interrupt the information listing flow.

Correct! Wrong!

About hooks it is incorrect to say:

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.

Hooks are functions that allow you to hook into React's state and lifecycle features from within functional components.

We can create our own hooks.

Correct! Wrong!

Props can be modified in child component directly like state

False

True

Correct! Wrong!

We can integrate reactJS in any of the existing web app

True

False

Correct! Wrong!