JS Practice — Built-in Objects

Object.getOwnPropertySymbols() — empty when no symbols

📖 Usage Example

// Get all Symbol-keyed properties
const sym = Symbol('id')
const obj = { [sym]: 1, name: 'Alice' }
Object.getOwnPropertySymbols(obj)   // → [Symbol(id)]

Use Object.getOwnPropertySymbols() to retrieve all symbol-keyed own properties, which are invisible to Object.keys().

Object.getOwnPropertySymbols() — no symbols

When an object has no Symbol-keyed properties, Object.getOwnPropertySymbols returns an empty array.

Challenge: Implement hasSymbols(obj) that returns true if the object has any Symbol keys.

hasSymbols({ a: 1 })                    // → false
hasSymbols({ [Symbol('x')]: 1 })        // → true

💡 Hints (1)

• Check `Object.getOwnPropertySymbols(obj).length > 0`.