animal_lab.md

Animal Kingdom

A Classic Model For Inheritance

Objective
Utilize class inheritance in coffee-script for Animals

Outline

• Using the class inheritance you've seen in class create an Animal Class. Keep count

  For example, Animal might have something like

   class Animal
   	constructor: (name, environment) ->
   		@name = name 
   		@environment = environment
  

  There is some descretion here, and you can feel free to try out default method arguments like we have in ruby, i.e.

   class Animal
   	constructor: (name, environment = "somewhere on earth") ->
   		@name = name 
   		@environment = environment
   		this.count ||= 0
   		this.count += 1
  

  Assume some default, creativity encouraged, functionality of your Animals, and give them a few methods. Try creating a private variable that keeps count of the number of animals.. maybe something like below

   class Animal
   	@_count: 0 # private variable
   	
   	constructor: (name, environment = "somewhere on earth") ->
   		@name = name 
   		@environment = environment
   		Animal._count++
  
   	@get_count: ->
   		 @_count
  

  but feel free to mix it up.

• Using the Animal class define two different subclass classes each having a class that inherits from it. See below.

            Animal  -> Mammal -> Dolphin
  

  and

            Animal -> Fish -> Shark