setInterval and clearInterval in Node.js - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to run a function every 2 seconds using setInterval.

Node.js

const intervalId = setInterval([1], 2000);

Drag options to blanks, or click blank then click option'

A() => console.log('Hello')

Bconsole.log('Hello')

Cconsole.log

DsetTimeout

Attempts:

3 left

💡 Hint

Common Mistakes

Passing console.log('Hello') directly runs it once instead of repeatedly.

Passing setTimeout instead of setInterval.

The setInterval function expects a function as its first argument. Using an arrow function () => console.log('Hello') correctly passes a function to run every 2 seconds.

2fill in blank

medium

Complete the code to stop the interval after 5 seconds using clearInterval.

Node.js

const intervalId = setInterval(() => console.log('Tick'), 1000);
setTimeout(() => [1](intervalId), 5000);

Drag options to blanks, or click blank then click option'

AstopInterval

BsetInterval

CclearTimeout

DclearInterval

Attempts:

3 left

💡 Hint

Common Mistakes

Using clearTimeout instead of clearInterval.

Trying to call setInterval again to stop it.

To stop a repeating interval, use clearInterval with the interval ID.

3fill in blank

hard

Fix the error in the code to correctly stop the interval after 3 seconds.

Node.js

const id = setInterval(() => console.log('Running'), 1000);
setTimeout(() => clearInterval([1]), 3000);

Drag options to blanks, or click blank then click option'

AintervalId

Bid

CsetInterval

DclearInterval

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a wrong variable name.

Using clearTimeout instead of clearInterval.

The variable id holds the interval ID. Pass it to clearInterval to correctly stop the interval after 3 seconds.

4fill in blank

hard

Fill both blanks to create an interval that logs 'Hi' every second and stops after 4 seconds.

Node.js

const [1] = setInterval(() => console.log('Hi'), 1000);
setTimeout(() => [2]([1]), 4000);

Drag options to blanks, or click blank then click option'

AintervalId

BclearInterval

CsetInterval

DtimeoutId

Attempts:

3 left

💡 Hint

Common Mistakes

Using setInterval instead of clearInterval to stop.

Using a variable name that doesn't match.

We store the interval ID in intervalId. To stop it, we call clearInterval(intervalId).

5fill in blank

hard

Fill all three blanks to create an interval that counts seconds and stops after 3 counts.

Node.js

let count = 0;
const [1] = setInterval(() => {
  [2];
  console.log(count);
  if (count === 3) {
    [3]([1]);
  }
}, 1000);

Drag options to blanks, or click blank then click option'

AintervalId

B++count

CclearInterval

Dcount++

Attempts:

3 left

💡 Hint

Common Mistakes

Using pre-increment (++count) instead of post-increment (count++).

Using clearTimeout instead of clearInterval.

We store the interval ID in intervalId. We increment count with count++. When count reaches 3, we stop the interval with clearInterval(intervalId).