JS Practice — Built-in Objects

Object.getOwnPropertyNames() — empty object

📖 Usage Example

// Get all own property names, including non-enumerable
const obj = { a: 1 }
Object.defineProperty(obj, 'hidden', { value: 2, enumerable: false })
Object.getOwnPropertyNames(obj)   // → ['a', 'hidden']

Use Object.getOwnPropertyNames() to list all own properties including non-enumerable ones, unlike Object.keys().

Object.getOwnPropertyNames() on empty objects

Calling Object.getOwnPropertyNames on {} returns an empty array because there are no own properties.

Challenge: Implement isEmptyObject(obj) that returns true if Object.getOwnPropertyNames(obj) has length 0.

isEmptyObject({})         // → true
isEmptyObject({ a: 1 })  // → false

💡 Hints (1)

• Symbols are NOT returned by `getOwnPropertyNames` — use `getOwnPropertySymbols` for those.