JS Practice — Built-in Objects

Object.getOwnPropertyDescriptor() — basic descriptor

📖 Usage Example

// Inspect a single property's descriptor
const obj = { x: 42 }
Object.getOwnPropertyDescriptor(obj, 'x')
// → { value: 42, writable: true, enumerable: true, configurable: true }

Use Object.getOwnPropertyDescriptor() to retrieve the descriptor object that describes a property's attributes.

Object.getOwnPropertyDescriptor()

Object.getOwnPropertyDescriptor(obj, key) returns the full descriptor object for an own property: { value, writable, enumerable, configurable }.

Challenge: Implement getDescriptor(obj, key) that returns the descriptor for the given key.

getDescriptor({ x: 1 }, 'x')
// → { value: 1, writable: true, enumerable: true, configurable: true }

💡 Hints (2)

• A plain property defined with `= ` has `writable:true, enumerable:true, configurable:true`.
• Returns `undefined` if the key does not exist as an own property.