JS Practice — Built-in Objects

Set isSupersetOf() — non-superset is false

📖 Usage Example

const a = new Set([1, 2, 3])
const b = new Set([1, 2])
a.isSupersetOf(b)   // → true
b.isSupersetOf(a)   // → false

Use Set.isSupersetOf() to check whether a set contains all elements of another set.

Set.prototype.isSupersetOf() (ES2025)

If B has an element not in A, isSupersetOf returns false.

Challenge: Verify that a non-superset returns false.

💡 Hints (1)