Foundations: composition aggregation

[gregkorte]

Create an exercise for the object composition and aggregation resource.

Idea:
Develop 3 new zoos for the state, each zoo having different unique characteristics with different selections of animals.

ChattanoogaZoo = Object.create(Zoo);
billy = Object.create(Goat);
BarnyardArea = Object.create(zooArea);
Barnyard.addAnimal(billy);
ChattanoogaZoo.zones.push(Barnyard);