Song List (used Bubble Sort)

gistfile1.rb

# Raymond Gan

# Given this List of Songs, Construct Arrays by Artist and Album
# Hint: Make use of the split() String Method
# http://www.ruby-doc.org/core-1.9.3/String.html#method-i-split

# Simple Example of Data Parsing
songs = [
  "The Magnetic Fields - 69 Love Songs - Parades Go By",
  "The Magnetic Fields - Get Lost - Smoke and Mirrors",
  "Neutral Milk Hotel - In An Aeroplane Over the Sea - Holland 1945",
  "The Magnetic Fields - Get Lost - You, Me, and the Moon",
  "The Magnetic Fields - 69 Love Songs - The Book of Love",
  "Neutral Milk Hotel - In An Aeroplane Over the Sea - The King of Carrot Flowers"
]

def aas(songs)      # create nested array
  songs2 = []
  songs.each do |s|
    cut  = []
    cut = s.split(' - ')
    songs2 << [cut[0], cut[1], cut[2]]
  end
  songs2
end

a = aas(songs)

(a.size).times do
  (0..a.size - 2).each do |row|
    if a[row][0] >= a[row+1][0]                   # sort by artist (column 0)
      a[row], a[row + 1] = a[row + 1], a[row]     # swap
    end
    #p a 
  end
end
puts

(a.size).times do
  (0..a.size - 2).each do |row|
    if a[row][1] > a[row+1][1] && a[row][0] >= a[row+1][0]    # sort by album (column 1)
      a[row], a[row + 1] = a[row + 1], a[row]
    end
    #p a 
  end
end
puts

(a.size).times do  
  (0..a.size - 2).each do |row|
    if a[row][2] > a[row+1][2] && a[row][1] >= a[row+1][1] && a[row][0] >= a[row+1][0]   # sort by song (column 2)
      a[row], a[row + 1] = a[row + 1], a[row]
    end
    #p a
  end
end

a.each do |song|
  puts "#{song[0]} - #{song[1]} - #{song[2]}"
end

# puts a.sort_by {|artist, album, song| [artist, album, song]}  -- quick way to solve it. Use sort_by method!

# Output:

#Neutral Milk Hotel - In An Aeroplane Over the Sea - Holland 1945
#Neutral Milk Hotel - In An Aeroplane Over the Sea - The King of Carrot Flowers
#The Magnetic Fields - 69 Love Songs - Parades Go By
#The Magnetic Fields - 69 Love Songs - The Book of Love
#The Magnetic Fields - Get Lost - Smoke and Mirrors
#The Magnetic Fields - Get Lost - You, Me, and the Moon