Day 3 - Classes

MINISWAN -- Matz is the creator of Ruby

• Matz
• Is
• Nice
• So
• We
• Are
• Nice

Goals

1. Scope
2. Classes
3. Inheritance
4. Initialize
5. Instance Variables

• A "class" is data (like a hash) plus behavior (methods)
• Instead of {first_name: "Jesse", last_name: "Wolgamott"}

class Person
  def initialize(first_name, last_name)
    @first_name = first_name
    @last_name = last_name
  end

  def full_name
    [@first_name, @last_name].join(" ")
  end
end

jwo = Person.new("jesse", "wolgamott")
jwo.full_name
=> "jesse wolgamott"

Assignment

Robot

• Define a Robot class
• A robot has a name
• A robot should have a method called say_hi and it should return "Hi!"
• A robot should have a method called say_name and it should return "My name is X" where X is the robot's name

BendingUnit

• Define a BendingUnit class
• A BendingUnit inherits from Robot
• A bending unit has a method called bend
• The bend method has one argument object_to_bend
• The bend method should put to the console "Bend X!" where X is object_to_bend

ActorUnit

• Define an ActorUnit class
• An ActorUnit inherits from Robot
• An ActorUnit has a method called change_name
• The change_name method accepts an argument new_name
• The change_name method changes the name property of Robot to new_name