ReactJS MCQs with Answers

What does the "webpack" command do?
A)
A module bundler
B)
Runs react local development server.
C)
Transpiles all the Javascript down into one file
D)
None of the above

Correct Answer :   A module bundler

Recent Updates in React.JS
Q .
What do you need to change about this code to get it to run?
class clock extends React.Component {
  render() {
    return <h1>Look at the time: {this.props.time}</h1>;
  }
}
A)
Remove this
B)
Capitalize clock
C)
Remove the render method
D)
Add quotes around the return value

Correct Answer :   Capitalize clock

Q .
Which Hook could be used to update the document's title?
A)
useEffect(function updateTitle() { document.title = name + ' ' + lastname; });
B)
useEffect(() => { title = name + ' ' + lastname; });
C)
useEffect(function updateTitle() { name + ' ' + lastname; });
D)
useEffect(function updateTitle() { title = name + ' ' + lastname; });

Correct Answer :   

useEffect(function updateTitle() { document.title = name + ' ' + lastname; });

Quick Links
Interview Questions
S/W Technology
Civil,   Mech
ECE,   EEE
More Technologies
MCQ (or) Quiz
S/W Technology
Civil,   Mech
ECE,   EEE
Aeronautical
Example Programs
C Language,   C++,   Java,   PHP,   Python
Articles
Marketing Management
Tech Updates
Tech Articles
Tools
Color Picker
Interest Calculator
EMI Calculator
Vehicle EMI Calculator
Compailers
HTML
C & CPP
PHP
Python