JS Built-ins
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ObjectObject.getOwnPropertyDescriptorintermediate

Object.getOwnPropertyDescriptor() — inherited returns undefined

📖 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() — own only

The method only looks at own properties. Inherited properties return undefined even if accessible via the prototype chain.

Challenge: Implement inheritedIsUndefined() that creates an object with a prototype that has protoKey, checks that getOwnPropertyDescriptor returns undefined for it, and returns that result.

inheritedIsUndefined() // → true
💡 Hints (1)
  • • `getOwnPropertyDescriptor` strictly checks own properties — the prototype chain is ignored.