Challenge 1
Make the function asynchronous.
javascript
Your answer
async function load() { return 42; }Press Ctrl⌘Enter to check your answer
Code Completion
8 Challenges
Complete the JavaScript Async Code
Practice async functions, await, error handling, async iteration, and Array.fromAsync.
Intermediate
~8 min read
Challenge 2
Await the Promise result.
javascript
Your answer
const value = Promise.resolve(42);Press Ctrl⌘Enter to check your answer
Challenge 3
Handle a rejected await.
javascript
Your answer
try { await request(); } Press Ctrl⌘Enter to check your answer
Challenge 4
Wait for independent operations together.
javascript
Your answer
const values = await Promise.([a(), b()]);Press Ctrl⌘Enter to check your answer
Challenge 5
Get the async iterator from a source.
javascript
Your answer
const iterator = source[Symbol.();Press Ctrl⌘Enter to check your answer
Challenge 6
Consume an async iterable.
javascript
Your answer
for (const value of source) { use(value); }Press Ctrl⌘Enter to check your answer
Challenge 7
Declare an async generator.
javascript
Your answer
async function stream() { yield 1; }Press Ctrl⌘Enter to check your answer
Challenge 8
Collect an async iterable into an array.
javascript
Your answer
const values = await Array.(source);Press Ctrl⌘Enter to check your answer