javascript-constructors

Question 1

What does the new operator do?

Answer 1

The new keyword does the following things:

Creates a blank, plain JavaScript object

Links (sets the constructor of) the newly created object to another object by setting the other object as its parent prototype;

Passes the newly created object from Step 1 as the this context;

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 tests to see if the prototype property of a constructor appears anywhere in the prototype chain of an object. Returns a boolean.