Challenge 1
Sum numbers precisely
javascript
Your answer
const result = (values);Press Ctrl⌘Enter to check your answer
Code Completion
8 Challenges
Modern ECMAScript Update Pass — Code Completion
Practice selecting modern standardized ECMAScript APIs.
Challenge 2
Concatenate iterators
javascript
Your answer
const result = [...(first, second)];Press Ctrl⌘Enter to check your answer
Challenge 3
Build from async input
javascript
Your answer
const result = await (source());Press Ctrl⌘Enter to check your answer
Challenge 4
Identify an Error
javascript
Your answer
const result = (value);Press Ctrl⌘Enter to check your answer
Challenge 5
Encode bytes as hex
javascript
Your answer
const result = bytes.();Press Ctrl⌘Enter to check your answer
Challenge 6
Decode hex bytes
javascript
Your answer
const result = Uint8Array.(text);Press Ctrl⌘Enter to check your answer
Challenge 7
Encode bytes as Base64
javascript
Your answer
const result = bytes.();Press Ctrl⌘Enter to check your answer
Challenge 8
Decode Base64
javascript
Your answer
const result = Uint8Array.(text);Press Ctrl⌘Enter to check your answer