JS Practice — Built-in Objects

Set entries() — spread to array

📖 Usage Example

const s = new Set(['a', 'b'])
for (const [key, val] of s.entries()) {
  console.log(key, val) // 'a' 'a', then 'b' 'b'
}

Use Set.entries() to iterate over [value, value] pairs; both elements are the same.

Set.prototype.entries()

Spread entries() to get all [value, value] pairs.

Challenge: Verify that spreading entries gives the correct nested array.

💡 Hints (1)