Understanding objects

Before we start looking at how JavaScript treats objects, we should spend some time on an object-oriented paradigm. Like most programming paradigms, object-oriented programming (OOP) also emerged from the need to manage complexity. The main idea is to divide the entire system into smaller pieces that are isolated from each other. If these small pieces can hide as many implementation details as possible, they become easy to use. A classic car analogy will help you understand this very important point about OOP.

When you drive a car, you operate on the interface—the steering, clutch, brake, and accelerator. Your view of using the car is limited by this interface, which makes it possible for us to drive the car. This interface is essentially hiding all the complex systems that really drive the car, such as the internal functioning of its engine, its electronic system, and so on. As a driver, you don't bother about these complexities. A similar idea is the primary driver...