Chapter 1. A Refresher of Objects

Any JavaScript programmer knows that almost everything in this scripting language is an object—from arrays to functions, from regular expressions to dates. We can say that what is not a primitive data type is an object. But, even the primitive data types such as numbers or strings have object wrappers, that is, they are accessible via objects. So, we can argue that objects are vital in JavaScript, and we need to learn the use of objects as best as we can in order to create better applications. One way, for example, to better use objects is applying the Object-Oriented Programming (OOP) paradigm.

However, before diving into principles and pattern of this programming approach, let's start this first chapter with a quick recap about objects fundamentals. In particular, the chapter will discuss:

• How to create and manage literal objects
• How to define object constructors
• What a prototype is and how to use it
• The new ECMAScript 2015 class construct and its relation to objects, constructors, and prototypes