javascript-constructors

Question 1

What does the new operator do?

Answer 1

1. Creates a blank, plain JavaScript object;
2. Links (sets the constructor of) the newly created object to another object by setting the other object as its parent prototype;
3. Passes the newly created object from Step 1 as the “this” context;
4. Returns “this” if the function doesn’t return an object.

Question 2

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

Answer 2

Prototype property.

Question 3

What does the instanceof operator do?

Answer 3

It checks if a prototype property appears anywhere in the prototype chain of an object.