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React.js MCQs

What programming concept React use for DOM manipulation and updating?

ReactDOM

Virtual DOM

Shadow DOM

Answer

Correct Answer: Virtual DOM

Explanation:

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More React.js MCQ Questions

Which of following is true about componentWillReceiveProps and getDerivedStateFromProps? (Check all that apply.)

Can you access refs at a wrapped component in higher-order component technique?

_____ function is used for attaching event listeners on markup rendered by ReactDOMServer.

How you can provide an initial value for uncontrolled input?

How can you bind a function to a component instance? (Check all that apply.)

What happens if the rendero is called again when the React element was previously rendered into container?

Program

function ListItem(props) {

return <li>{props.value}</li>;

}

function NList(props) {

const numbers = props.numbers;

return (

<ul>

???

</ul>

);

}

const numbers = [8, 6, 4, 2, 1];

ReactDOM.render(

<NList numbers={numbers} />,

document.getElementById('root')

);

Output

• 8

• 6

• 4

• 2

• 1

" class="related-a">

Which of the following code snippets should be there in place of "???" in the below given program so that the following output is printed on the console?

Program

function ListItem(props) {

return <li>{props.value}</li>;

}

function NList(props) {

const numbers = props.numbers;

return (

<ul>

???

</ul>

);

}

const numbers = [8, 6, 4, 2, 1];

ReactDOM.render(

<NList numbers={numbers} />,

document.getElementById('root')

);

Output

• 8

• 6

• 4

• 2

• 1

Consider the given render method which is required to return the content enclosed inside parentheses.

render: function0{

return (

<div> Render me here </div>

);

}

In relation to the given information, which of the following statements is/ are true?

1. If JSX starts on the same line as the return. then parentheses are not needed.

2. Without the parentheses, JavaScript will ignore the given lines and return without a value.

Select True or False.

If the order of items may change in React then the use of indexes should be used for keys.

Which of the following statements is/are correct about the React method, createFactory()?

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