JS Practice — Built-in Objects

Object.getPrototypeOf() — null prototype

📖 Usage Example

// Get the prototype of an object
const arr = []
Object.getPrototypeOf(arr) === Array.prototype   // → true
Object.getPrototypeOf({}) === Object.prototype   // → true

Use Object.getPrototypeOf() to retrieve the prototype of an object, allowing you to inspect its inheritance chain.

Object.getPrototypeOf() — null

Object.create(null) creates an object with no prototype. Object.getPrototypeOf returns null for such objects.

Challenge: Implement nullProtoIsNull() that creates an object with Object.create(null) and returns whether its prototype is null.

nullProtoIsNull() // → true

💡 Hints (1)

• `Object.create(null)` creates an object completely outside the normal prototype chain.