01_everything_is_an_object.rb

1.odd?                                  # => true
1 + 1                                   # => 2
1.+(1)                                  # => 2
1.send(:odd?)                           # => true
names = ["Steven", "Sophie", "Antoin"]  # => ["Steven", "Sophie", "Antoin"]
names[0]                                # => "Steven"
names.[](0)                             # => "Steven"
steven = {name: "Steven"}               # => {:name=>"Steven"}
steven[:name]                           # => "Steven"
steven.[](:name)                        # => "Steven"
:name.zorp!                             # ~> NoMethodError: undefined method `zorp!' for :name:Symbol

# ~> NoMethodError
# ~> undefined method `zorp!' for :name:Symbol
# ~>
# ~> /Users/StevenNunez/school/web-0416/lectures/03-object-orientation/code/01_everything_is_an_object.rb:11:in `<main>'

02_object_new.rb

work = Object.new  # => #<Object:0x007fe91214a0e8>
def work.title
  @title           # => "Work", "Work"
end

def work.set_title(new_title)
  @title = new_title           # => "Work"
end

def work.artists
  @artists        # => ["Rihanna", "Drake"], ["Rihanna", "Drake"]
end

def work.set_artists(new_artists)
  @artists = new_artists           # => ["Rihanna", "Drake"]
end

def work.describe
  "#{self.title} by #{self.artists.join(' and ')}"  # => "Work by Rihanna and Drake"
end

def work.duration
  @duration        # => "3 Minutes"
end

def work.set_duration(new_duration)
  @duration = new_duration           # => "3 Minutes"
end

ultra_lightbeam = Object.new  # => #<Object:0x007fe912149e18>
def ultra_lightbeam.title
  @title                      # => "Ultra Lightbeam", "Ultra Lightbeam"
end

def ultra_lightbeam.set_title(new_title)
  @title = new_title                      # => "Ultra Lightbeam"
end

def ultra_lightbeam.artists
  @artists                   # => ["Kayne West"], ["Kayne West"]
end

def ultra_lightbeam.set_artists(new_artists)
  @artists = new_artists                      # => ["Kayne West"]
end

def ultra_lightbeam.describe
  "#{self.title} by #{self.artists.join(' and ')}"  # => "Ultra Lightbeam by Kayne West"
end

def ultra_lightbeam.duration
  @duration                   # => "4 Minutes, 1 Second"
end

def ultra_lightbeam.set_duration(new_duration)
  @duration = new_duration                      # => "4 Minutes, 1 Second"
end

work.set_title("Work")                  # => "Work"
work.title                              # => "Work"
work.set_artists(["Rihanna", "Drake"])  # => ["Rihanna", "Drake"]
work.artists                            # => ["Rihanna", "Drake"]
work.describe                           # => "Work by Rihanna and Drake"
work.set_duration("3 Minutes")          # => "3 Minutes"
work.duration                           # => "3 Minutes"

ultra_lightbeam.set_title("Ultra Lightbeam")         # => "Ultra Lightbeam"
ultra_lightbeam.title                                # => "Ultra Lightbeam"
ultra_lightbeam.set_artists(["Kayne West"])          # => ["Kayne West"]
ultra_lightbeam.artists                              # => ["Kayne West"]
ultra_lightbeam.describe                             # => "Ultra Lightbeam by Kayne West"
ultra_lightbeam.set_duration("4 Minutes, 1 Second")  # => "4 Minutes, 1 Second"
ultra_lightbeam.duration                             # => "4 Minutes, 1 Second"

03_classes.rb

# Song = Class.new do  # => Class
class Song
  attr_accessor :title, :artists, :duration           # => nil
  # def title
  #   @title   # => "Work!", "Work!"
  # end
  #
  # def title=(new_title)
  #   @title = new_title   # => "Work!"
  # end
  #
  # def artists
  #   @artists   # => ["Rihanna", "Drake"], ["Rihanna", "Drake"]
  # end
  #
  # def artists=(new_artists)
  #   @artists = new_artists   # => ["Rihanna", "Drake"]
  # end
  # def duration
  #   @duration   # => "3 Minutes"
  # end
  #
  # def duration=(new_duration)
  #   @duration = new_duration   # => "3 Minutes"
  # end
  def describe
    "#{self.title} by #{self.artists.join(' and ')}"  # => "Work! by Rihanna and Drake"
  end
end

work = Song.new                      # => #<Song:0x007f94c20ae688>
work.title = "Work!"                 # => "Work!"
work.title                           # => "Work!"
work.artists = ["Rihanna", "Drake"]  # => ["Rihanna", "Drake"]
work.artists                         # => ["Rihanna", "Drake"]
work.describe                        # => "Work! by Rihanna and Drake"
work.duration = "3 Minutes"          # => "3 Minutes"
work.duration                        # => "3 Minutes"

04_class_methods_variables.rb

class Song
  PURPOSE = "Use this class to Make songs"                            # => "Use this class to Make songs"
  @@purpose = "The same as above"                                     # => "The same as above"
  # @@all = []
  attr_accessor :title, :artists, :duration                           # => nil
  def initialize(title: title, artists: artists, duration: duration)
    @title = title                                                    # => "Work"
    @artists = artists                                                # => ["Rihanna", "Drake"]
    @duration = duration                                              # => "3 Minutes"
    # @@all << self
  end

  def self.purpose
    "Use this class to make Songs"
    PURPOSE
    @@purpose
  end

  def describe
    "#{self.title} by #{self.artists.join(' and ')}"                  # => "Work by Rihanna and Drake"
  end
end


work = Song.new(title: "Work", artists: ["Rihanna", "Drake"], duration: "3 Minutes")  # => #<Song:0x007fa583045fa8 @title="Work", @artists=["Rihanna", "Drake"], @duration="3 Minutes">
Song::PURPOSE                                                                         # => "Use this class to Make songs"
Song::@@purpose
work.title                                                                            # => "Work"
work.artists                                                                          # => ["Rihanna", "Drake"]
work.describe                                                                         # => "Work by Rihanna and Drake"
work.duration                                                                         # => "3 Minutes"