JavaScript ZOOP Lab

In this lab, you will be building a simulation of a virtual zoo using object-oriented programming (OOP) principles in JavaScript. The goal of this lab is to practice defining base and derived classes, using constructors, and method overriding.

Getting Started

• Fork and clone this repo, cd into the new folder.
• Use index.js to complete the assignment.
• After working on your code use node index.js to test it!

Instructions

Base Animal Class

Create a base Animal class that has the following properties:

• name
• species
• age
• gender

Add the following methods:

• describe -- prints out all information about the animal
• feed -- prints out "<animalName> is eating"
• makeSound -- prints out "<animalName> is making a sound"
• move -- prints out "<animalName> is moving"

Extending the Base Animal Class

Create the following child class that derives from the base Animal class, adding properties and using method override when needed:

• Mammal -- has a furColor property that is printed out in its description
  • drinks milk when feeding
  • walks when moving
  • growls when making a sound

Create a Zoo class with an animals property that is a list of all of the animals in the zoo.

Creating a Zoo Class

The Zoo class should have the following methods:

• addAnimal -- adds an animal to the list
• displayAnimals -- displays information for all animals
• feedAnimals -- feeds all animals
• listenToAnimals -- listens to all the animals
• watchAnimals -- watches the animals move around

Bonus

Create additional child classes to populate your zoo!

• Bird -- has a wingspan property that is printed out in its description
  • drinks nectar when feeding
  • flies when moving
  • chirps when making a sound
• Reptile -- has a scaleColor property that is printed out in its description
  • eats insects when feeding
  • slithers when moving
  • hisses when making a sound

Example Code

Example code:

const zoo = new Zoo();

const lion = new Mammal("Simba", "Lion", 5, "male", "golden");
const snake = new Reptile("Kaa", "Snake", 4, "female", "green"); // example bonus reptile

lion.makeSound();
// > Simba is making a sound
// > Simba is growling

zoo.addAnimal(lion);
zoo.addAnimal(snake);
zoo.feedAnimals();
// > Simba is eating
// > Simba is drinking milk
// > Kaa is eating
// > Kaa is eating insects

Write similar code chunks to test your zoo's methods and the various animals you create.

Further Reading

This lab asks you to implement what is referred to as the Strategy Pattern, which is a object oriented Design Pattern made famous by the Gang of Four Design Patterns Book, a seminal software engineering text on OOP. More info about the Strategy Pattern can be found here.

MDN contains a wonderfully complete tutorial on JS Classes containing even more than we have covered together.