Everything is an object in JavaScript

The few things that aren't objects like the primitives (number, string, boolean...) will temporarily be wrapped as objects when needed.

JavaScript Objects are not common oop objects

There are no classes in JavaScript because JavaScript is a prototype object oriented language. This means that objects in JavaScript directly inherit from other objects. Hence we don't need classes.

What The H... prototype inheritance means?

Prototype is like the evolution for objects, it chains one object to another, sharing the information stored which is also dynamically linked to the parent

There should be a better way to create fishes

Constructor functions are the most used way in JavaScript to construct prototype chains.

so my fishes have colors and sizes, lets make them swim, eat.. sleep

so.. here is the thing... functions are objects and objects can contain objects... and those things could be in the protoype

What about ES6 classes?

So, we have Function Constructors, which have been the common way to build new objects until ES6. sometimes Function Constructors can be confusing to understand (especially if you want to model inheritance). To alleviate this, ES6 introduces the class syntax.

Why fishes?

I am a diver... ;)