Challenge 1
Create a fulfilled Promise from a value.
javascript
Your answer
const result = Promise.(42);Press Ctrl⌘Enter to check your answer
Code Completion
8 Challenges
Complete the JavaScript Promises Code
Practice chaining and choosing Promise APIs by outcome contract.
Intermediate
~8 min read
Challenge 2
Transform the result with then.
javascript
Your answer
Promise.resolve(2).(value => value * 3);Press Ctrl⌘Enter to check your answer
Challenge 3
Handle a rejection.
javascript
Your answer
promise.(handleError);Press Ctrl⌘Enter to check your answer
Challenge 4
Run cleanup after settlement.
javascript
Your answer
promise.(cleanup);Press Ctrl⌘Enter to check your answer
Challenge 5
Wait for every operation to fulfill.
javascript
Your answer
const values = await Promise.([a, b, c]);Press Ctrl⌘Enter to check your answer
Challenge 6
Collect every outcome.
javascript
Your answer
const results = await Promise.([a, b]);Press Ctrl⌘Enter to check your answer
Challenge 7
Use the first settlement.
javascript
Your answer
const first = await Promise.([a, b]);Press Ctrl⌘Enter to check your answer
Challenge 8
Use the first fulfillment.
javascript
Your answer
const winner = await Promise.([a, b]);Press Ctrl⌘Enter to check your answer