JS Practice — Built-in Objects

Object.getPrototypeOf() — class instance 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() — classes

When you create an instance with new MyClass(), the prototype is MyClass.prototype.

Challenge: Implement classInstanceProto() that creates a class Foo, instantiates it, and returns whether the prototype is Foo.prototype.

classInstanceProto() // → true

💡 Hints (1)

• `new Foo()` sets the instance prototype to `Foo.prototype`.