Ruby/Class/Member method

company_name = "Software"
def company_name.legalese
  return "#{self} is a registered trademark."
end
company_name.legalese
# => "Homegrown Software is a registered trademark of ConglomCo International."
"Some Other Company".legalese
# NoMethodError: undefined method "legalese" for "Some Other Company":String

class Square
  def initialize(side_length)
    @side_length = side_length
  end
  def area
    @side_length * @side_length
  end
end
a = Square.new(10)
b = Square.new(5)
puts a.area
puts b.area

class MyNumber
  def initialize
    @secret = rand(20)
  end
  def hint
    puts "#{" not " if secret <= 10}greater than 10."
  end
 
  def secret
    @secret
  end
end
class OurNumber < MyNumber
  def hint
    lower = secret-rand(10)-1
    upper = secret+rand(10)+1
    "The number is somewhere between #{lower} and #{upper}."
  end
end
class OurNumber
  def compare(other)
    if secret == other.secret
    comparison = "equal to"
    else
      comparison = secret > other.secret ? "greater than" : "less than"
    end
    "This secret number is #{comparison} the secret number you passed in."
  end
end
a = OurNumber.new
b = OurNumber.new
puts a.hint
puts b.hint
a.rupare(b)

class Horse
  def name
    @name = "Easy Jet"
  end
end
h = Horse.new
h.name
# The method name is the kind of method that is referred to as an accessor method or getter. 
# It gets a property (the value of a variable) from an instance of a class.

class Account
  attr_reader :name, :balance
  def initialize(n, b)
    @name = n
    @balance = b
  end
  def add_interest(rate)
    @balance += @balance * rate / 100
  end
  def display
    printf("%s, you have $%5.2f in your account.\n",
            @name, @balance)
  end
end
my_account = Account.new("Barry", 10.00)
my_account.add_interest(5.0)
my_account.display
your_account = Account.new("Harriet", 100.00)
your_account.add_interest(7.0)
your_account.display

class AllVowels
  @@vowels = %w{a e i o u}
  def each
    @@vowels.each { |v| yield v }
  end
end
x = AllVowels.new
x.each { |v| puts v }