Promise.race and Promise.allSettled in Node.js - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to use Promise.race to get the first resolved promise.

Node.js

Promise.[1]([promise1, promise2]).then(result => console.log(result));

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

AallSettled

Ball

Crace

Dany

Attempts:

3 left

💡 Hint

Common Mistakes

Using Promise.all instead of Promise.race, which waits for all promises.

Using Promise.allSettled which waits for all promises to settle.

Promise.race returns a promise that resolves or rejects as soon as one of the promises in the iterable resolves or rejects.

2fill in blank

medium

Complete the code to use Promise.allSettled to wait for all promises to settle.

Node.js

Promise.[1]([promiseA, promiseB]).then(results => console.log(results));

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

Aall

Brace

Cany

DallSettled

Attempts:

3 left

💡 Hint

Common Mistakes

Using Promise.all which rejects immediately if any promise rejects.

Using Promise.race which returns the first settled promise only.

Promise.allSettled waits for all promises to settle, regardless of resolve or reject, and returns their results.

3fill in blank

hard

Fix the error in the code to correctly handle the first settled promise.

Node.js

Promise.[1]([p1, p2, p3]).then(value => console.log('First:', value));

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

AallSettled

Brace

Call

Dany

Attempts:

3 left

💡 Hint

Common Mistakes

Using Promise.all which waits for all promises to resolve.

Using Promise.allSettled which returns all results, not just the first.

To get the first settled promise's value, use Promise.race. Other methods behave differently.

4fill in blank

hard

Fill both blanks to create a Promise.allSettled usage that logs each promise's status and value.

Node.js

Promise.[1]([pA, pB]).then(results => {
  results.forEach(result => {
    console.log(result.[2] + ':', result.value || result.reason);
  });
});

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

AallSettled

Brace

Cstatus

Dall

Attempts:

3 left

💡 Hint

Common Mistakes

Using Promise.all which rejects on first failure.

Trying to access 'value' without checking status.

Promise.allSettled returns an array of objects with status and either value or reason. Logging status shows if each promise fulfilled or rejected.

5fill in blank

hard

Fill all three blanks to create a Promise.race that handles the first promise and logs its result or error.

Node.js

Promise.[1]([pX, pY, pZ])
  .then(result => console.log('Resolved:', result))
  .catch(error => console.log('Rejected:', error));

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

Arace

BallSettled

Call

Dany

Attempts:

3 left

💡 Hint

Common Mistakes

Using Promise.all which waits for all promises.

Not handling rejection with catch.

Promise.race returns a promise that settles as soon as one of the promises settles, either resolved or rejected. The then handles success, and catch handles rejection.