The document provides an overview of topics covered in a Ruby week 3 homework including arrays, hashes, modules, inheritance, numbers, and ranges. Students are asked to complete a reading assignment from a questions.txt file and work on a calculator_spec.rb file. Key collection types like arrays and hashes are demonstrated with examples.

1. Ruby
Week 3

2. HOmeWOrk REview
Walk Through Simon Says
Questions Should be Answered in Class
Git / Github Review Sheet

3. Collections

4. Array
Ordered List
Referenced by Order(index)

5. Hash
Key, Value Store
Referenced by Name(key)

6. Array and Hash Exercise
numbers = [5,4,7,1,3,2,6]
numbers[0]
numbers.size
more_numbers = {“one” => 1, “two” => 2, 3 => “three”}
more_numbers[“one”]

7. Modules
Sharing Behavior
Namespacing
DRY Code
Composition

8. Enumerable
Module for Collection Specific Actions
Search
Sort
Iterate (Enumerate)

9. Demo Enumerable
load ‘monsters.rb’
$monsters
How many monsters are nocturnal?
What are the names of the monsters that are nocturnal?
How many legs do all our monsters have?
What are the 2 most common dangers and vulnerabilities of our monsters?

10. Module Exercise
named_thing.rb
Vampire’s have names
Human’s have names

11. Inheritance
Parent-Child
SubTypes

12. Inheritance Exercise
monster.rb
Monster
Vampire (vampire.rb)
Zombie
Werewolf

13. Numbers
FixNum
1 is always 1! (unlike strings)
Floats (BigDecimal)
4.2
3.141516

14. Ranges
1..5
1...5
a..z

15. HomeWork
Reading in questions.txt
calculator_spec.rb