Objects

Question 1

What is an object?

Answer 1

A collection of key:value pairs.

Question 2

What is object literal syntax?

Answer 2

const circle = { } ;

Under the hood, it is created using the built in object constructor function:

const circle = new Object( );

(the same happens with strings, boolean)

Question 3

What is a method?

Answer 3

A function used to define some logic within an object

Question 4

What is a property?

Answer 4

Properties are used to hold values within an object

Question 5

What are the two ways to create an object in OOP?

Answer 5

Constructor function (using this. & new)

Factory function (using return & does not use .this)

Question 6

Why is there a constructor property on each object in OOP?

Answer 6

Every object has a constructor function property because it references the function that was used to create it

Question 7

What is a getter?

Answer 7

A getter is a function that is used to read a property.

Question 8

What is a setter?

Answer 8

You create a setter which allows you to set the value of a property / throw errors if the value is not what is to be expected