JS Practice — Built-in Objects

Set has() — after add

📖 Usage Example

const s = new Set([1, 2, 3])
s.has(2)   // → true
s.has(99)  // → false

Use Set.has() to check if a value exists in the set.

Set.prototype.has()

After add(), has() returns true for that value.

Challenge: Verify that has() returns true after add().

💡 Hints (1)