JavaScript Constructors

Question 1

What kind of inheritance does the JavaScript programming language use?

Answer 1

Prototype based inheritance

Question 2

What is a prototype in JavaScript?

Answer 2

Objects that have methods athat are usable by all objects in js

Question 3

How is it possible to call methods on strings, arrays, and numbers even though those methods don’t actually exist on objects, arrays, and numbers?

Answer 3

Prototypes: Prototypal inhetitnace.

Question 4

If an object does not have it’s own property or method by a given key, where does JavaScript look for it?

Answer 4

__proto__

Question 5

What does the new operator do?

Answer 5

Creates a plain JavaScript Object

Question 6

What property of JavaScript functions can store shared behavior for instances created with new?

Answer 6

prototype

Question 7

What does the instanceof operator do?

Answer 7

return boolean if the object on the left is an instance of the object on the right