Test Yourself: Prerequisites
Test your knowledge of JavaScript and React before you take the lessons in this course.
Choose the correct answer(s).
1
Which parts of the document get rerendered after the timer updates in the code below?
function tick() {
const element = (
<div>
<h1>Hello, world!</h1>
<h2>Time = {new Date().toLocaleTimeString()}.</h2>
</div>
);
ReactDOM.render(element, document.getElementById('root'));
}
setInterval(tick, 1000);
A)
The whole content
B)
Only the h1
element
C)
Only the h2
element
D)
Nothing
Question 1 of 150 attempted
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