JS Practice — Built-in Objects

Set difference() — B empty keeps A

📖 Usage Example

const a = new Set([1, 2, 3, 4])
const b = new Set([3, 4, 5])
const diff = a.difference(b)
console.log([...diff]) // → [1, 2]

Use Set.difference() to get elements in the first set that are not in the second.

Set.prototype.difference() (ES2025)

When B is empty, difference equals A.

Challenge: Verify that A.difference(empty) equals A.

💡 Hints (1)