FREE Building React App Questions and Answers

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About hooks it is incorrect to say:

We can create our own hooks.

Hooks don't 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.

Hooks work inside classes and allow you to use React without classes.

Correct! Wrong!

What is the result of the expression

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

2

6

4

3

Correct! Wrong!

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

Keys help React identify which items have changed.

The braces interrupt the information listing flow.

Keys are not mandatory.

The keys are mandatory to prevent the application from stopping.

Correct! Wrong!

Props can be modified in child component directly like state

True

False

Correct! Wrong!

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

True

False

Correct! Wrong!

Is the use of JSX mandatory to develop with React?

Yes

Sometimes

No

Correct! Wrong!

We can integrate reactJS in any of the existing web app

True

False

Correct! Wrong!

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