Building React App

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What is the result of the expression

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

6

3

2

4

Correct! Wrong!

About hooks it is incorrect to say:

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

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.

Correct! Wrong!

Props can be modified in child component directly like state

True

False

Correct! Wrong!

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

Keys are not mandatory.

The keys are mandatory to prevent the application from stopping.

The braces interrupt the information listing flow.

Keys help React identify which items have changed.

Correct! Wrong!

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

False

True

Correct! Wrong!

We can integrate reactJS in any of the existing web app

True

False

Correct! Wrong!

Is the use of JSX mandatory to develop with React?

Sometimes

Yes

No

Correct! Wrong!