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TVDDFTTJPO A Refactoring Story in Ruby Katrina Owen @kytrinyx http://exercism.io

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I know an old lady who swallowed a . fly

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I know an old lady who swallowed a . spider She swallowed the spider to catch the fly.

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I know an old lady who swallowed a . bird She swallowed the bird to catch the spider. She swallowed the spider to catch the fly.

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I know an old lady who swallowed a . cat She swallowed the cat to catch the bird. She swallowed the bird to catch the spider. She swallowed the spider to catch the fly.

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I know an old lady who swallowed a . dog She swallowed the dog to catch the cat. She swallowed the cat to catch the bird. She swallowed the bird to catch the spider. She swallowed the spider to catch the fly.

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I know an old lady who swallowed a . goat She swallowed the goat to catch the dog. She swallowed the dog to catch the cat. She swallowed the cat to catch the bird. She swallowed the bird to catch the spider. She swallowed the spider to catch the fly.

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I know an old lady who swallowed a . cow She swallowed the cow to catch the goat. She swallowed the goat to catch the dog. She swallowed the dog to catch the cat. She swallowed the cat to catch the bird. She swallowed the bird to catch the spider. She swallowed the spider to catch the fly.

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I know an old lady who swallowed a . horse

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EFBE PGDPVSTF 4IFT

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What a hog, to swallow a dog! She swallowed the dog to catch the She swallowed the cat to catch the She swallowed the bird to catch th She swallowed the spider to catch I don't know why she swallowed the I know an old lady who swallowed a Just opened her throat and swallow

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<<-SONG I know an old lady who swallowed a fly. # ... She's dead, of course! SONG

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def lyrics <<-SONG I know an old lady who swallowed a fly. # ... She's dead, of course! SONG end

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class Song def lyrics <<-SONG I know an old lady who swallowed a fly. # ... She's dead, of course! SONG end end

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JOUIF CFHJOOJOH

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OPQF

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BOETPJU CFHJOT

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OPQF

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class SongTest < Minitest::Test def test_lyrics <<-SONG I know an old lady who swallowed a fly. # ... She's dead, of course! SONG end end

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class SongTest < Minitest::Test def test_lyrics expected = <<-SONG I know an old lady who swallowed a fly. # ... She's dead, of course! SONG assert_equal expected, Song.new.song end end

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PODFVQPOB UJNF

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OPQF

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SFGBDUPS

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It wriggled and jiggled and tickled inside her. She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll I know an old lady who swallowed a bird. How absurd to swallow a bird! She swallowed the bird to catch the spider that wriggle She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll I know an old lady who swallowed a cat. Imagine that, to swallow a cat! She swallowed the cat to catch the bird. She swallowed the bird to catch the spider that wriggle She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll

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EVQMJDBUJPO

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# ... I know an old lady who swallowed a fly. # ... I know an old lady who swallowed a spider. # ... I know an old lady who swallowed a bird. # ... I know an old lady who swallowed a cat. # ... I know an old lady who swallowed a dog. # ... I know an old lady who swallowed a goat. # ... I know an old lady who swallowed a cow. # ... I know an old lady who swallowed a horse. # ...

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# ... She swallowed the dog to catch the cat. She swallowed the cat to catch the bird. She swallowed the bird to catch the spider that wriggled and She swallowed the spider to catch the fly. # ... She swallowed the goat to catch the dog. She swallowed the dog to catch the cat. She swallowed the cat to catch the bird. She swallowed the bird to catch the spider that wriggled and She swallowed the spider to catch the fly. # ... She swallowed the cow to catch the goat. She swallowed the goat to catch the dog. She swallowed the dog to catch the cat. She swallowed the cat to catch the bird. She swallowed the bird to catch the spider that wriggled and

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I know an old lady who swallowed a dog. What a hog, to swallow a dog! She swallowed the dog to catch the cat. She swallowed the cat to catch the bird. She swallowed the bird to catch the spider that wriggled and She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a goat. Just opened her throat and swallowed a goat! She swallowed the goat to catch the dog. She swallowed the dog to catch the cat. She swallowed the cat to catch the bird. She swallowed the bird to catch the spider that wriggled and She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die.

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<<-SONG I know an old lady who swallowed a fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a spider. It wriggled and jiggled and tickled inside her. She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a bird. How absurd to swallow a bird! She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her. She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a cat. Imagine that, to swallow a cat! She swallowed the cat to catch the bird. She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her. She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a dog. What a hog, to swallow a dog! She swallowed the dog to catch the cat. She swallowed the cat to catch the bird. She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her. She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a goat. Just opened her throat and swallowed a goat! She swallowed the goat to catch the dog. She swallowed the dog to catch the cat. She swallowed the cat to catch the bird. She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her. She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a cow. I don't know how she swallowed a cow! She swallowed the cow to catch the goat. She swallowed the goat to catch the dog. She swallowed the dog to catch the cat. She swallowed the cat to catch the bird. She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her. She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a horse. She's dead, of course! SONG

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JOEJSFDUJPO

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case i when 1 "I know an old lady who swallowed a fly.\n" + "I don't know why she swallowed the fly. Perhaps...\n" when 2 "I know an old lady who swallowed a spider.\n" + "It wriggled and jiggled and tickled inside her.\n" + "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps...\n" when 3 "I know an old lady who swallowed a bird.\n" + "How absurd to swallow a bird!\n" + "She swallowed the bird to catch the spider that..." + "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps...\n" when 4

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(1..8).map {|i| case i when 1 # ... when n # ... end }.join("\n")

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def lyrics (1..8).map {|i| case i when 1 # ... when n # ... end }.join("\n") end

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def song (1..8).map {|i| case i when 1 # ... when n # ... end }.join("\n") end

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def song (1..8).map {|i| verse(i) }.join("\n") end

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private def verse(i) case i when 1 # ... when n # ... end end

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case i when 1 "I know an old lady who swallowed a fly.\n" + "I don't know why she swallowed the fly. Perhaps she'l when 2 "I know an old lady who swallowed a spider.\n" + "It wriggled and jiggled and tickled inside her.\n" + "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps she'l when 3 "I know an old lady who swallowed a bird.\n" + "How absurd to swallow a bird!\n" + "She swallowed the bird to catch the spider that wrigg "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps she'l

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case i when 1 "I know an old lady who swallowed a fly.\n" + "I don't know why she swallowed the fly. Perhaps she'l when 2 "I know an old lady who swallowed a spider.\n" + "It wriggled and jiggled and tickled inside her.\n" + "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps she'l when 3 "I know an old lady who swallowed a bird.\n" + "How absurd to swallow a bird!\n" + "She swallowed the bird to catch the spider that wrigg "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps she'l

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case i when 1 "I know an old lady who swallowed a fly.\n" + "I don't know why she swallowed the fly. Perhaps she'l when 2 "I know an old lady who swallowed a spider.\n" + "It wriggled and jiggled and tickled inside her.\n" + "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps she'l when 3 "I know an old lady who swallowed a bird.\n" + "How absurd to swallow a bird!\n" + "She swallowed the bird to catch the spider that wrigg "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps she'l

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case i when 1 "I know an old lady who swallowed a fly.\n" + "I don't know why she swallowed the fly. Perhaps she'l when 2 "I know an old lady who swallowed a spider.\n" + "It wriggled and jiggled and tickled inside her.\n" + "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps she'l when 3 "I know an old lady who swallowed a bird.\n" + "How absurd to swallow a bird!\n" + "She swallowed the bird to catch the spider that wrigg "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps she'l

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UFNQMBUFEBUB

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"template vs data"

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"template vs %s" % "data"

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"template vs %s" % "data"

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"template vs %s" % "data"

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"template vs %s" % "data"

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"%s vs template" % "data"

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"template vs %s" % "data"

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"template vs %s" % "data"

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case i when 1 "I know an old lady who swallowed a fly.\n" when 2 "I know an old lady who swallowed a spider.\n" when 3 "I know an old lady who swallowed a bird.\n" when 4 "I know an old lady who swallowed a cat.\n" when 5 "I know an old lady who swallowed a dog.\n" when 6 "I know an old lady who swallowed a goat.\n" when 7 "I know an old lady who swallowed a cow.\n" when 8 "I know an old lady who swallowed a horse.\n" end

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case i when 1 "I know an old lady who swallowed a %s.\n" % "fly" when 2 "I know an old lady who swallowed a %s.\n" % "spider" when 3 "I know an old lady who swallowed a %s.\n" % "bird" when 4 "I know an old lady who swallowed a %s.\n" % "cat" when 5 "I know an old lady who swallowed a %s.\n" % "dog" when 6 "I know an old lady who swallowed a %s.\n" % "goat" when 7 "I know an old lady who swallowed a %s.\n" % "cow" when 8 "I know an old lady who swallowed a %s.\n" % "horse" end

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case i when 1 "I know an old lady who swallowed a %s.\n" % "fly" when 2 "I know an old lady who swallowed a %s.\n" % "spider" when 3 "I know an old lady who swallowed a %s.\n" % "bird" when 4 "I know an old lady who swallowed a %s.\n" % "cat" when 5 "I know an old lady who swallowed a %s.\n" % "dog" when 6 "I know an old lady who swallowed a %s.\n" % "goat" when 7 "I know an old lady who swallowed a %s.\n" % "cow" when 8 "I know an old lady who swallowed a %s.\n" % "horse" end

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"She swallowed the bird to catch the spider that wrig "She swallowed the spider to catch the fly.\n" + when 6 "She swallowed the goat to catch the dog.\n" + "She swallowed the dog to catch the cat.\n" + "She swallowed the cat to catch the bird.\n" + "She swallowed the bird to catch the spider that wrig "She swallowed the spider to catch the fly.\n" + when 7 "She swallowed the cow to catch the goat.\n" + "She swallowed the goat to catch the dog.\n" + "She swallowed the dog to catch the cat.\n" + "She swallowed the cat to catch the bird.\n" + "She swallowed the bird to catch the spider that wrig "She swallowed the spider to catch the fly.\n" + when 8

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"She swallowed the %s to catch the %s.\n" % ["bird", "She swallowed the %s to catch the %s.\n" % ["spider when 6 "She swallowed the %s to catch the %s.\n" % ["goat", "She swallowed the %s to catch the %s.\n" % ["dog", "She swallowed the %s to catch the %s.\n" % ["cat", "She swallowed the %s to catch the %s.\n" % ["bird", "She swallowed the %s to catch the %s.\n" % ["spider when 7 "She swallowed the %s to catch the %s.\n" % ["goat", "She swallowed the %s to catch the %s.\n" % ["dog", "She swallowed the %s to catch the %s.\n" % ["cat", "She swallowed the %s to catch the %s.\n" % ["bird", "She swallowed the %s to catch the %s.\n" % ["spider "She swallowed the %s to catch the %s.\n" % ["spider when 8

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"I know an old lady who swallowed a %s.\n" % "%s\n" % "She swallowed the %s to catch the %s.\n" % "She swallowed the %s to catch the %s.\n" % "She swallowed the %s to catch the %s.\n" % "She swallowed the %s to catch the %s.\n" % "She swallowed the %s to catch the %s.\n" % "She swallowed the %s to catch the %s.\n" % "%s\n" %

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% "cow" + % "I don't know how she swallowed a cow!" + % ["cow", "goat"] + % ["goat", "dog"] + % ["dog", "cat"] + % ["cat", "bird"] + % ["bird", "spider that wriggled and..."] + % ["spider", "fly"] + % "I don't know why she swallowed the fly...

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<<-SONG I know an old lady who swallowed a fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a spider. It wriggled and jiggled and tickled inside her. She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a bird. How absurd to swallow a bird! She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her. She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a cat. Imagine that, to swallow a cat! She swallowed the cat to catch the bird. She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her. She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a dog. What a hog, to swallow a dog! She swallowed the dog to catch the cat. She swallowed the cat to catch the bird. She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her. She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a goat. Just opened her throat and swallowed a goat! She swallowed the goat to catch the dog. She swallowed the dog to catch the cat. She swallowed the cat to catch the bird. She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her. She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a cow. I don't know how she swallowed a cow! She swallowed the cow to catch the goat. She swallowed the goat to catch the dog. She swallowed the dog to catch the cat. She swallowed the cat to catch the bird. She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her. She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a horse. She's dead, of course! SONG

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case i when 1 "I know an old lady who swallowed a fly.\n" + "I don't know why she swallowed the fly. Perhaps she'll die.\n" when 2 "I know an old lady who swallowed a spider.\n" + "It wriggled and jiggled and tickled inside her.\n" + "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps she'll die.\n" when 3 "I know an old lady who swallowed a bird.\n" + "How absurd to swallow a bird!\n" + "She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.\n" + "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps she'll die.\n" when 4 "I know an old lady who swallowed a cat.\n" + "Imagine that, to swallow a cat!\n" + "She swallowed the cat to catch the bird.\n" + "She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.\n" + "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps she'll die.\n" when 5 "I know an old lady who swallowed a dog.\n" + "What a hog, to swallow a dog!\n" + "She swallowed the dog to catch the cat.\n" + "She swallowed the cat to catch the bird.\n" + "She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.\n" + "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps she'll die.\n" when 6 "I know an old lady who swallowed a goat.\n" + "Just opened her throat and swallowed a goat!\n" + "She swallowed the goat to catch the dog.\n" + "She swallowed the dog to catch the cat.\n" + "She swallowed the cat to catch the bird.\n" + "She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.\n" + "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps she'll die.\n" when 7 "I know an old lady who swallowed a cow.\n" + "I don't know how she swallowed a cow!\n" + "She swallowed the cow to catch the goat.\n" + "She swallowed the goat to catch the dog.\n" + "She swallowed the dog to catch the cat.\n" + "She swallowed the cat to catch the bird.\n" + "She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.\n" + "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps she'll die.\n" when 8 "I know an old lady who swallowed a horse.\n" + "She's dead, of course!\n" end

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case i when 1 "I know an old lady who swallowed a %s.\n" % "fly" + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 2 "I know an old lady who swallowed a %s.\n" % "spider" + "%s\n" % "It wriggled and jiggled and tickled inside her." + "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 3 "I know an old lady who swallowed a %s.\n" % "bird" + "%s\n" % "How absurd to swallow a bird!" + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggled and tickled inside her"] + "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 4 "I know an old lady who swallowed a %s.\n" % "cat"+ "%s\n" % "Imagine that, to swallow a cat!" + "She swallowed the %s to catch the %s.\n" % ["cat", "bird"] + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggled and tickled inside her"] + "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 5 "I know an old lady who swallowed a %s.\n" % "dog" + "%s\n" % "What a hog, to swallow a dog!" + "She swallowed the %s to catch the %s.\n" % ["dog", "cat"] + "She swallowed the %s to catch the %s.\n" % ["cat", "bird"] + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggled and tickled inside her"] + "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 6 "I know an old lady who swallowed a %s.\n" % "goat" + "%s\n" % "Just opened her throat and swallowed a goat!" + "She swallowed the %s to catch the %s.\n" % ["goat", "dog"] + "She swallowed the %s to catch the %s.\n" % ["dog", "cat"] + "She swallowed the %s to catch the %s.\n" % ["cat", "bird"] + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggled and tickled inside her"] + "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 7 "I know an old lady who swallowed a %s.\n" % "cow" + "%s\n" % "I don't know how she swallowed a cow!" + "She swallowed the %s to catch the %s.\n" % ["cow", "goat"] + "She swallowed the %s to catch the %s.\n" % ["goat", "dog"] + "She swallowed the %s to catch the %s.\n" % ["dog", "cat"] + "She swallowed the %s to catch the %s.\n" % ["cat", "bird"] + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggled and tickled inside her"] + "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 8 "I know an old lady who swallowed a %s.\n" % "horse" + "%s\n" % "She's dead, of course!" end

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No content

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BMHPSJUIN

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case i when 1 "I know an old lady who swallowed a %s.\n" % "%s\n" %

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case i when 2 "I know an old lady who swallowed a %s.\n" % "%s\n" % "She swallowed the %s to catch the %s.\n" % "%s\n" %

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case i when 3 "I know an old lady who swallowed a %s.\n" % "%s\n" % "She swallowed the %s to catch the %s.\n" % "She swallowed the %s to catch the %s.\n" % "%s\n" %

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case i when 4 "I know an old lady who swallowed a %s.\n" % "%s\n" % "She swallowed the %s to catch the %s.\n" % "She swallowed the %s to catch the %s.\n" % "She swallowed the %s to catch the %s.\n" % "%s\n" %

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case i when 5 "I know an old lady who swallowed a %s.\n" % "%s\n" % "She swallowed the %s to catch the %s.\n" % "She swallowed the %s to catch the %s.\n" % "She swallowed the %s to catch the %s.\n" % "She swallowed the %s to catch the %s.\n" % "%s\n" %

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case i when 6 "I know an old lady who swallowed a %s.\n" % "%s\n" % "She swallowed the %s to catch the %s.\n" % "She swallowed the %s to catch the %s.\n" % "She swallowed the %s to catch the %s.\n" % "She swallowed the %s to catch the %s.\n" % "She swallowed the %s to catch the %s.\n" % "%s\n" %

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case i when 7 "I know an old lady who swallowed a %s.\n" % "%s\n" % "She swallowed the %s to catch the %s.\n" % "She swallowed the %s to catch the %s.\n" % "She swallowed the %s to catch the %s.\n" % "She swallowed the %s to catch the %s.\n" % "She swallowed the %s to catch the %s.\n" % "She swallowed the %s to catch the %s.\n" % "%s\n" %

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case i when 8 "I know an old lady who swallowed a %s.\n" % "%s\n" %

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"She swallowed the %s to catch the %s"

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"She swallowed the %s to catch the %s" * n

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"She swallowed the %s to catch the %s" % [predator, prey]

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"She swallowed the %s to catch the %s." % [ predator, prey, ]

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def swallow(predator, prey) "She swallowed the %s to catch the %s." % [ predator, prey, ] end

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def to_catch(predator, prey) "She swallowed the %s to catch the %s." % [ predator, prey, ] end

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def blue "FF0000" end

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"She swallowed the %s to catch the %s." % [ predator, prey, ]

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def recurring_line(predator, prey) "She swallowed the %s to catch the %s." % [ predator, prey, ] end

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def incremental_sentence(predator, prey) "She swallowed the %s to catch the %s." % [ predator, prey, ] end

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def middle_phrase(predator, prey) "She swallowed the %s to catch the %s." % [ predator, prey, ] end

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"She swallowed the %s to catch the %s." % [ predator, prey, ]

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def reasoning(predator, prey) "She swallowed the %s to catch the %s." % [ predator, prey, ] end

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def why(predator, prey) "She swallowed the %s to catch the %s." % [ predator, prey, ] end

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def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator, prey, ] end

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["cow", "goat"] ["goat", "dog"] ["dog", "cat"] ["cat", "bird"] ["bird", "spider"] ["spider", "fly"]

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["cow", "goat"] ["goat", "dog"] ["dog", "cat"] ["cat", "bird"] ["bird", "spider"] ["spider", "fly"]

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["cow", "goat"] ["goat", "dog"] ["dog", "cat"] ["cat", "bird"] ["bird", "spider"] ["spider", "fly"]

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["cow", "goat"] ["goat", "dog"] ["dog", "cat"] ["cat", "bird"] ["bird", "spider"] ["spider", "fly"]

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["cow", "goat"] ["goat", "dog"] ["dog", "cat"] ["cat", "bird"] ["bird", "spider"] ["spider", "fly"]

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["cow", "goat"] ["goat", "dog"] ["dog", "cat"] ["cat", "bird"] ["bird", "spider"] ["spider", "fly"]

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["cow", "goat", "dog", ...]

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[...].each_cons(2)

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["cow", "goat", "dog", "cat", "bird", ...]

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critters.each_cons(2).map {|pair| motivation(*pair) }

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critters.each_cons(2).map {|pair| motivation(*pair) }

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critters.each_cons(2).map {|pair| motivation(*pair) }.join("\n")

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def sequence(critters) critters.each_cons(2).map {|pair| motivation(*pair) }.join("\n") end

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def chain(critters) critters.each_cons(2).map {|pair| motivation(*pair) }.join("\n") end

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food chain BIJFSBSDIJDBMTFSJFTPG PSHBOJTNTFBDIEFQFOEFOU POUIFOFYUBTBTPVSDFPG GPPE

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def chain(critters) critters.each_cons(2).map {|pair| motivation(*pair) }.join("\n") end def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator, prey, ] end

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"She swallowed the cow to catch the goat.\n" + "She swallowed the goat to catch the dog.\n" + "She swallowed the dog to catch the cat.\n" + "She swallowed the cat to catch the bird.\n" + "She swallowed the bird to catch the spider.\n" + "She swallowed the spider to catch the fly.\n" +

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def chain(critters) critters.each_cons(2).map {|pair| motivation(*pair) }.join("\n") end def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator, prey, ] end

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No content

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BOPNBMZ

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She swallowed the cow to catch the goat. She swallowed the goat to catch the dog. She swallowed the dog to catch the cat. She swallowed the cat to catch the bird. She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her. She swallowed the spider to catch the fly.

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if prey == "spider" # ... else # ... end

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EJGGFSFODF

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if prey == "spider" "She swallowed [...] that wriggled [...]." else "She swallowed [...]." end

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if prey == "spider" "She swallowed [...] that wriggled [...]." else "She swallowed [...]." end

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if prey == "spider" "She swallowed [...] that wriggled [...]." else "She swallowed [...]." end

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if prey == "spider" "She swallowed [...] that wriggled [...]." else "She swallowed [...]." end

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if prey == "spider" " that wriggled [...]" else ??? end

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if prey == "spider" " that wriggled [...]" end

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TZNNFUSZ

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if prey == "spider" " that wriggled..." else "" end

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def distinctive_features if prey == "spider" " that wriggled..." else "" end end

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def qualifier if prey == "spider" " that wriggled..." else "" end end

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if prey == "spider" " that wriggled..." end

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def spider_tag if prey == "spider" " that wriggled..." end end

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def qualifier if prey == "spider" " that wriggled..." else "" end end

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def qualifier(prey) if prey == "spider" " that wriggled..." else "" end end

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def qualifier(critter) if critter == "spider" " that wriggled..." else "" end end

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qualifier(critter)

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critter.qualifier

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class Critter < Struct.new(:name, :qualifier) end

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class Song DATA = [ ] end

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class Song DATA = [ ["horse"], ["cow"], ["goat"], ["dog"], ["cat"], ["bird"], ["spider", "that wriggled ..."], ["fly"], ] end

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class Song DATA = [...] attr_reader :critters def initialize @critters = DATA.map {|row| Critter.new(*row) } end end

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def motivation(predator, prey) # ... end

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def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator.name, [ prey.name, prey.qualifier, ].compact.join(" "), ] end

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class Critter < Struct.new(:name, :qualifier) end class Song # ... def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator.name, [ prey.name, prey.qualifier, ].compact.join(" "), ] end # ... end

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def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator.name, [ prey.name, prey.qualifier, ].compact.join(" "), ] end

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def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator, prey, ] end

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def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator.name, [ prey.name, prey.qualifier, ].compact.join(" "), ] end

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def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator.name, [ prey.name, prey.qualifier, ].compact.join(" "), ] end TMI

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[ critter.name, critter.qualifier ].compact.join(" ")

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def epithet(critter) [ critter.name, critter.qualifier ].compact.join(" ") end

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def epithet(critter) [ critter.name, critter.qualifier ].compact.join(" ") end

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class Critter < Struct.new(:name, :qualifier) def epithet [ name, qualifier ].compact.join(" ") end end

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No content

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"%s\n" % "I don't know why she swallowed the fly. when 4 "I know an old lady who swallowed a %s.\n" % "cat"+ "%s\n" % "Imagine that, to swallow a cat!" + "She swallowed the %s to catch the %s.\n" % ["cat", "bird"] + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggle "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. when 5 "I know an old lady who swallowed a %s.\n" % "dog" + "%s\n" % "What a hog, to swallow a dog!" + "She swallowed the %s to catch the %s.\n" % ["dog", "cat"] + "She swallowed the %s to catch the %s.\n" % ["cat", "bird"] + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggle "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. when 6 "I know an old lady who swallowed a %s.\n" % "goat" + "%s\n" % "Just opened her throat and swallowed a g "She swallowed the %s to catch the %s.\n" % ["goat", "dog"] + "She swallowed the %s to catch the %s.\n" % ["dog", "cat"] + "She swallowed the %s to catch the %s.\n" % ["cat", "bird"] + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggle

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"%s\n" % "I don't know why she swallowed the fly. when 4 "I know an old lady who swallowed a %s.\n" % "cat"+ "%s\n" % "Imagine that, to swallow a cat!" + "She swallowed the %s to catch the %s.\n" % ["cat", "bird"] + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggle "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. when 5 "I know an old lady who swallowed a %s.\n" % "dog" + "%s\n" % "What a hog, to swallow a dog!" + "She swallowed the %s to catch the %s.\n" % ["dog", "cat"] + "She swallowed the %s to catch the %s.\n" % ["cat", "bird"] + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggle "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. when 6 "I know an old lady who swallowed a %s.\n" % "goat" + "%s\n" % "Just opened her throat and swallowed a g "She swallowed the %s to catch the %s.\n" % ["goat", "dog"] + "She swallowed the %s to catch the %s.\n" % ["dog", "cat"] + "She swallowed the %s to catch the %s.\n" % ["cat", "bird"] + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggle

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"%s\n" % "I don't know why she swallowed the fly. when 4 "I know an old lady who swallowed a %s.\n" % "cat"+ "%s\n" % "Imagine that, to swallow a cat!" + "%s\n" % chain(4) + "%s\n" % "I don't know why she swallowed the fly. when 5 "I know an old lady who swallowed a %s.\n" % "dog" + "%s\n" % "What a hog, to swallow a dog!" + "%s\n" % chain(5) + "%s\n" % "I don't know why she swallowed the fly. when 6 "I know an old lady who swallowed a %s.\n" % "goat" + "%s\n" % "Just opened her throat and swallowed a g "%s\n" % chain(6) + "%s\n" % "I don't know why she swallowed the fly. when 7 "I know an old lady who swallowed a %s.\n" % "cow" + "%s\n" % "I don't know how she swallowed a cow!" + "%s\n" % chain(7) + "%s\n" % "I don't know why she swallowed the fly. when 8 "I know an old lady who swallowed a %s.\n" % "horse" +

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# Running: . 1 assertions, 0 failures, 0 errors, 0 skips

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case i when 1 "I know an old lady who swallowed a %s.\n" % "fly" + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 2 "I know an old lady who swallowed a %s.\n" % "spider" + "%s\n" % "It wriggled and jiggled and tickled inside her." + "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 3 "I know an old lady who swallowed a %s.\n" % "bird" + "%s\n" % "How absurd to swallow a bird!" + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggled and tickled inside her"] + "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 4 "I know an old lady who swallowed a %s.\n" % "cat"+ "%s\n" % "Imagine that, to swallow a cat!" + "She swallowed the %s to catch the %s.\n" % ["cat", "bird"] + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggled and tickled inside her"] + "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 5 "I know an old lady who swallowed a %s.\n" % "dog" + "%s\n" % "What a hog, to swallow a dog!" + "She swallowed the %s to catch the %s.\n" % ["dog", "cat"] + "She swallowed the %s to catch the %s.\n" % ["cat", "bird"] + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggled and tickled inside her"] + "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 6 "I know an old lady who swallowed a %s.\n" % "goat" + "%s\n" % "Just opened her throat and swallowed a goat!" + "She swallowed the %s to catch the %s.\n" % ["goat", "dog"] + "She swallowed the %s to catch the %s.\n" % ["dog", "cat"] + "She swallowed the %s to catch the %s.\n" % ["cat", "bird"] + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggled and tickled inside her"] + "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 7 "I know an old lady who swallowed a %s.\n" % "cow" + "%s\n" % "I don't know how she swallowed a cow!" + "She swallowed the %s to catch the %s.\n" % ["cow", "goat"] + "She swallowed the %s to catch the %s.\n" % ["goat", "dog"] + "She swallowed the %s to catch the %s.\n" % ["dog", "cat"] + "She swallowed the %s to catch the %s.\n" % ["cat", "bird"] + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggled and tickled inside her"] + "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 8 "I know an old lady who swallowed a %s.\n" % "horse" + "%s\n" % "She's dead, of course!" end

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case i when 1 "I know an old lady who swallowed a %s.\n" % "fly" + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 2 "I know an old lady who swallowed a %s.\n" % "spider" + "%s\n" % "It wriggled and jiggled and tickled inside her." + "%s\n" % chain(2) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 3 "I know an old lady who swallowed a %s.\n" % "bird" + "%s\n" % "How absurd to swallow a bird!" + "%s\n" % chain(3) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 4 "I know an old lady who swallowed a %s.\n" % "cat"+ "%s\n" % "Imagine that, to swallow a cat!" + "%s\n" % chain(4) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 5 "I know an old lady who swallowed a %s.\n" % "dog" + "%s\n" % "What a hog, to swallow a dog!" + "%s\n" % chain(5) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 6 "I know an old lady who swallowed a %s.\n" % "goat" + "%s\n" % "Just opened her throat and swallowed a goat!" + "%s\n" % chain(6) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 7 "I know an old lady who swallowed a %s.\n" % "cow" + "%s\n" % "I don't know how she swallowed a cow!" + "%s\n" % chain(7) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 8 "I know an old lady who swallowed a %s.\n" % "horse" + "%s\n" % "She's dead, of course!" end

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class Critter < Struct.new(:name, :qualifier) def epithet [name, qualifier].compact.join(" ") end end class Song DATA = [ ["horse"], ["cow"], ["goat"], ["dog"], ["cat"], ["bird"], ["spider", "that wriggled and jiggled and tickled inside her"], ["fly"], ] attr_reader :critters def initialize @critters = DATA.map {|row| Critter.new(*row)} end def lyrics (1..8).map {|i| verse(i)}.join("\n") end private def chain(i) critters.last(i).each_cons(2).map {|pair| motivation(*pair) }.join("\n") end def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator.name, prey.epithet, ] end # ... end class Song # continued ... def verse(i) case i when 1 "I know an old lady who swallowed a %s.\n" % "fly" + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 2 "I know an old lady who swallowed a %s.\n" % "spider" + "%s\n" % "It wriggled and jiggled and tickled inside her." + "%s\n" % chain(2) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 3 "I know an old lady who swallowed a %s.\n" % "bird" + "%s\n" % "How absurd to swallow a bird!" + "%s\n" % chain(3) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 4 "I know an old lady who swallowed a %s.\n" % "cat"+ "%s\n" % "Imagine that, to swallow a cat!" + "%s\n" % chain(4) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 5 "I know an old lady who swallowed a %s.\n" % "dog" + "%s\n" % "What a hog, to swallow a dog!" + "%s\n" % chain(5) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 6 "I know an old lady who swallowed a %s.\n" % "goat" + "%s\n" % "Just opened her throat and swallowed a goat!" + "%s\n" % chain(6) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 7 "I know an old lady who swallowed a %s.\n" % "cow" + "%s\n" % "I don't know how she swallowed a cow!" + "%s\n" % chain(7) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 8 "I know an old lady who swallowed a %s.\n" % "horse" + "%s\n" % "She's dead, of course!" end end end

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TJNJMBSJUZ

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when 5 "I know an old lady..." % "dog" + "%s\n" % "What a hog, to swallow a dog!" + "%s\n" % chain(5) + "%s\n" % "I don't know why..." when 6 "I know an old lady..." % "goat" + "%s\n" % "Just opened her throat and swallowed a goat!" + "%s\n" % chain(6) + "%s\n" % "I don't know why..." when 7 "I know an old lady..." % "cow" + "%s\n" % "I don't know how she swallowed a cow!" + "%s\n" % chain(7) + "%s\n" % "I don't know why..." when 8

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when 5 "I know an old lady..." % "dog" + "%s\n" % "What a hog, to swallow a dog!" + "%s\n" % chain(5) + "%s\n" % "I don't know why..." when 6 "I know an old lady..." % "goat" + "%s\n" % "Just opened her throat and swallowed a goat!" + "%s\n" % chain(6) + "%s\n" % "I don't know why..." when 7 "I know an old lady..." % "cow" + "%s\n" % "I don't know how she swallowed a cow!" + "%s\n" % chain(7) + "%s\n" % "I don't know why..." when 8

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when 5 "I know an old lady..." % "dog" + "%s\n" % "What a hog, to swallow a dog!" + "%s\n" % chain(5) + "%s\n" % "I don't know why..." when 6 "I know an old lady..." % "goat" + "%s\n" % "Just opened her throat and swallowed a goat!" + "%s\n" % chain(6) + "%s\n" % "I don't know why..." when 7 "I know an old lady..." % "cow" + "%s\n" % "I don't know how she swallowed a cow!" + "%s\n" % chain(7) + "%s\n" % "I don't know why..." when 8

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when 5 "I know an old lady..." % "dog" + "%s\n" % "What a hog, to swallow a dog!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 6 "I know an old lady..." % "goat" + "%s\n" % "Just opened her throat and swallowed a goat!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 7 "I know an old lady..." % "cow" + "%s\n" % "I don't know how she swallowed a cow!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 8

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when 5 "I know an old lady..." % "dog" + "%s\n" % "What a hog, to swallow a dog!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 6 "I know an old lady..." % "goat" + "%s\n" % "Just opened her throat and swallowed a goat!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 7 "I know an old lady..." % "cow" + "%s\n" % "I don't know how she swallowed a cow!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 8

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when 5 "I know an old lady..." % "dog" + "%s\n" % "What a hog, to swallow a dog!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 6 "I know an old lady..." % "goat" + "%s\n" % "Just opened her throat and swallowed a goat!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 7 "I know an old lady..." % "cow" + "%s\n" % "I don't know how she swallowed a cow!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 8

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when 5 "I know an old lady..." % "dog" + "%s\n" % "What a hog, to swallow a dog!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 6 "I know an old lady..." % "goat" + "%s\n" % "Just opened her throat and swallowed a goat!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 7 "I know an old lady..." % "cow" + "%s\n" % "I don't know how she swallowed a cow!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 8

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critters.last(i).first

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critters.last(i).first.name

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when 5 "I know an old lady..." % "dog" + "%s\n" % "What a hog, to swallow a dog!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 6 "I know an old lady..." % "goat" + "%s\n" % "Just opened her throat and swallowed a goat!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 7 "I know an old lady..." % "cow" + "%s\n" % "I don't know how she swallowed a cow!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 8

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when 5 "I know an old lady..." % critters.last(i).first.name + "%s\n" % "What a hog, to swallow a dog!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 6 "I know an old lady..." % critters.last(i).first.name + "%s\n" % "Just opened her throat and swallowed a goat!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 7 "I know an old lady..." % critters.last(i).first.name + "%s\n" % "I don't know how she swallowed a cow!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 8

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when 5 "I know an old lady..." % critters.last(i).first.name + "%s\n" % "What a hog, to swallow a dog!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 6 "I know an old lady..." % critters.last(i).first.name + "%s\n" % "Just opened her throat and swallowed a goat!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 7 "I know an old lady..." % critters.last(i).first.name + "%s\n" % "I don't know how she swallowed a cow!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 8

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when 5 "I know an old lady..." % critters.last(i).first.name + "%s\n" % "What a hog, to swallow a dog!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 6 "I know an old lady..." % critters.last(i).first.name + "%s\n" % "Just opened her throat and swallowed a goat!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 7 "I know an old lady..." % critters.last(i).first.name + "%s\n" % "I don't know how she swallowed a cow!" + "%s\n" % chain(i) + "%s\n" % "I don't know why..." when 8

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I know an old lady who swallowed a . fly I don't know why she swallowed a fly. Perhaps she'll die.

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I know an old lady who swallowed a . spider It wriggled and jiggled and tickled inside her.

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I know an old lady who swallowed a . bird How absurd to swallow a bird!

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I know an old lady who swallowed a . cat Imagine that, to swallow a cat!

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I know an old lady who swallowed a . dog What a hog, to swallow a dog!

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I know an old lady who swallowed a . goat Just opened her throat and swallowed a goat!

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I know an old lady who swallowed a . cow I don't know how she swallowed a cow!

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I know an old lady who swallowed a . horse She's dead, of course!

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critter.aside

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class Song DATA = [ ["horse"], ["cow"], ["goat"], ["dog"], ["cat"], ["bird"], ["spider", "that wriggled ..."], ["fly"], ] end

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class Song DATA = [ ["horse", nil, "She's dead, of course!"], ["cow", nil, "I don't know how..."], ["goat", nil, "Just opened her throat..."], ["dog", nil, "What a hog, to swallow a dog!"], ["cat", nil, "Imagine that, to swallow a cat!"], ["bird"], ["spider", "that wriggled...", "It wriggled..."], ["fly", nil, "I don't know why..."], ] end

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when 5 "I know an old lady..." % critters.last(i).first.name + "%s\n" % "What a hog, to swallow a dog!" + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly..." when 6 "I know an old lady..." % critters.last(i).first.name + "%s\n" % "Just opened her throat and swallowed a goat!" + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly..." when 7 "I know an old lady..." % critters.last(i).first.name + "%s\n" % "I don't know how she swallowed a cow!" + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly..." when 8

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when 5 "I know an old lady..." % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly..." when 6 "I know an old lady..." % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly..." when 7 "I know an old lady..." % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly..." when 8

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when 5 "I know an old lady..." % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly..." when 6 "I know an old lady..." % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly..." when 7 "I know an old lady..." % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly..." when 8

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when 4 "I know an old lady..." % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 5 "I know an old lady..." % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 6 "I know an old lady..." % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 7 "I know an old lady..." % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 8

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case i when 1, 8 "I know an old lady..." % critters.last(i).first.name + "%s\n" % "I don't know why she swallowed the fly. Perhaps..." else "I know an old lady..." % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly. Perhaps..." end

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<<-SONG I know an old lady who swallowed a fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a spider. It wriggled and jiggled and tickled inside her. She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a bird. How absurd to swallow a bird! She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her. She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a cat. Imagine that, to swallow a cat! She swallowed the cat to catch the bird. She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her. She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a dog. What a hog, to swallow a dog! She swallowed the dog to catch the cat. She swallowed the cat to catch the bird. She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her. She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a goat. Just opened her throat and swallowed a goat! She swallowed the goat to catch the dog. She swallowed the dog to catch the cat. She swallowed the cat to catch the bird. She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her. She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a cow. I don't know how she swallowed a cow! She swallowed the cow to catch the goat. She swallowed the goat to catch the dog. She swallowed the dog to catch the cat. She swallowed the cat to catch the bird. She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her. She swallowed the spider to catch the fly. I don't know why she swallowed the fly. Perhaps she'll die. I know an old lady who swallowed a horse. She's dead, of course! SONG

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case i when 1 "I know an old lady who swallowed a fly.\n" + "I don't know why she swallowed the fly. Perhaps she'll die.\n" when 2 "I know an old lady who swallowed a spider.\n" + "It wriggled and jiggled and tickled inside her.\n" + "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps she'll die.\n" when 3 "I know an old lady who swallowed a bird.\n" + "How absurd to swallow a bird!\n" + "She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.\n" + "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps she'll die.\n" when 4 "I know an old lady who swallowed a cat.\n" + "Imagine that, to swallow a cat!\n" + "She swallowed the cat to catch the bird.\n" + "She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.\n" + "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps she'll die.\n" when 5 "I know an old lady who swallowed a dog.\n" + "What a hog, to swallow a dog!\n" + "She swallowed the dog to catch the cat.\n" + "She swallowed the cat to catch the bird.\n" + "She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.\n" + "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps she'll die.\n" when 6 "I know an old lady who swallowed a goat.\n" + "Just opened her throat and swallowed a goat!\n" + "She swallowed the goat to catch the dog.\n" + "She swallowed the dog to catch the cat.\n" + "She swallowed the cat to catch the bird.\n" + "She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.\n" + "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps she'll die.\n" when 7 "I know an old lady who swallowed a cow.\n" + "I don't know how she swallowed a cow!\n" + "She swallowed the cow to catch the goat.\n" + "She swallowed the goat to catch the dog.\n" + "She swallowed the dog to catch the cat.\n" + "She swallowed the cat to catch the bird.\n" + "She swallowed the bird to catch the spider that wriggled and jiggled and tickled inside her.\n" + "She swallowed the spider to catch the fly.\n" + "I don't know why she swallowed the fly. Perhaps she'll die.\n" when 8 "I know an old lady who swallowed a horse.\n" + "She's dead, of course!\n" end

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case i when 1 "I know an old lady who swallowed a %s.\n" % "fly" + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 2 "I know an old lady who swallowed a %s.\n" % "spider" + "%s\n" % "It wriggled and jiggled and tickled inside her." + "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 3 "I know an old lady who swallowed a %s.\n" % "bird" + "%s\n" % "How absurd to swallow a bird!" + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggled and tickled inside her"] + "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 4 "I know an old lady who swallowed a %s.\n" % "cat"+ "%s\n" % "Imagine that, to swallow a cat!" + "She swallowed the %s to catch the %s.\n" % ["cat", "bird"] + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggled and tickled inside her"] + "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 5 "I know an old lady who swallowed a %s.\n" % "dog" + "%s\n" % "What a hog, to swallow a dog!" + "She swallowed the %s to catch the %s.\n" % ["dog", "cat"] + "She swallowed the %s to catch the %s.\n" % ["cat", "bird"] + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggled and tickled inside her"] + "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 6 "I know an old lady who swallowed a %s.\n" % "goat" + "%s\n" % "Just opened her throat and swallowed a goat!" + "She swallowed the %s to catch the %s.\n" % ["goat", "dog"] + "She swallowed the %s to catch the %s.\n" % ["dog", "cat"] + "She swallowed the %s to catch the %s.\n" % ["cat", "bird"] + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggled and tickled inside her"] + "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 7 "I know an old lady who swallowed a %s.\n" % "cow" + "%s\n" % "I don't know how she swallowed a cow!" + "She swallowed the %s to catch the %s.\n" % ["cow", "goat"] + "She swallowed the %s to catch the %s.\n" % ["goat", "dog"] + "She swallowed the %s to catch the %s.\n" % ["dog", "cat"] + "She swallowed the %s to catch the %s.\n" % ["cat", "bird"] + "She swallowed the %s to catch the %s.\n" % ["bird", "spider that wriggled and jiggled and tickled inside her"] + "She swallowed the %s to catch the %s.\n" % ["spider", "fly"] + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 8 "I know an old lady who swallowed a %s.\n" % "horse" + "%s\n" % "She's dead, of course!" end

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def verse(i) case i when 1 "I know an old lady who swallowed a %s.\n" % "fly" + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 2 "I know an old lady who swallowed a %s.\n" % "spider" + "%s\n" % "It wriggled and jiggled and tickled inside her." + "%s\n" % chain(2) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 3 "I know an old lady who swallowed a %s.\n" % "bird" + "%s\n" % "How absurd to swallow a bird!" + "%s\n" % chain(3) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 4 "I know an old lady who swallowed a %s.\n" % "cat"+ "%s\n" % "Imagine that, to swallow a cat!" + "%s\n" % chain(4) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 5 "I know an old lady who swallowed a %s.\n" % "dog" + "%s\n" % "What a hog, to swallow a dog!" + "%s\n" % chain(5) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 6 "I know an old lady who swallowed a %s.\n" % "goat" + "%s\n" % "Just opened her throat and swallowed a goat!" + "%s\n" % chain(6) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 7 "I know an old lady who swallowed a %s.\n" % "cow" + "%s\n" % "I don't know how she swallowed a cow!" + "%s\n" % chain(7) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 8 "I know an old lady who swallowed a %s.\n" % "horse" + "%s\n" % "She's dead, of course!" end end def chain(i) critters.last(i).each_cons(2).map {|pair| motivation(*pair) }.join("\n") end def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator.name, prey.epithet, ] end

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class Critter < Struct.new(:name, :qualifier, :aside) def epithet [name, qualifier].compact.join(" ") end end

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case i when 1 "I know an old lady who swallowed a %s.\n" % "fly" + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 2 "I know an old lady who swallowed a %s.\n" % "spider" + "%s\n" % "It wriggled and jiggled and tickled inside her." + "%s\n" % chain(2) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 3 "I know an old lady who swallowed a %s.\n" % "bird" + "%s\n" % "How absurd to swallow a bird!" + "%s\n" % chain(3) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 4 "I know an old lady who swallowed a %s.\n" % "cat"+ "%s\n" % "Imagine that, to swallow a cat!" + "%s\n" % chain(4) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 5 "I know an old lady who swallowed a %s.\n" % "dog" + "%s\n" % "What a hog, to swallow a dog!" + "%s\n" % chain(5) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 6 "I know an old lady who swallowed a %s.\n" % "goat" + "%s\n" % "Just opened her throat and swallowed a goat!" + "%s\n" % chain(6) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 7 "I know an old lady who swallowed a %s.\n" % "cow" + "%s\n" % "I don't know how she swallowed a cow!" + "%s\n" % chain(7) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 8 "I know an old lady who swallowed a %s.\n" % "horse" + "%s\n" % "She's dead, of course!" end

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case i when 1 "I know an old lady who swallowed a %s.\n" % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside when 2 "I know an old lady who swallowed a %s.\n" % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 3 "I know an old lady who swallowed a %s.\n" % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 4 "I know an old lady who swallowed a %s.\n" % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 5 "I know an old lady who swallowed a %s.\n" % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 6 "I know an old lady who swallowed a %s.\n" % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 7 "I know an old lady who swallowed a %s.\n" % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." when 8 "I know an old lady who swallowed a %s.\n" % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside end

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case i when 1, 8 "I know an old lady who swallowed a %s.\n" % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside else "I know an old lady who swallowed a %s.\n" % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain(i) + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." end

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DPIFTJPO

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class Song def initialize # ... def lyrics # ... private def verse(i) # ... def chain(i) # ... def motivation(predator, prey) # ... end

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class Song def initialize # ... def lyrics # ... private def verse(i) # ... def chain(i) # ... def motivation(predator, prey) # ... end

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class Song def initialize # ... def lyrics # ... end class Verse def verse(i) # ... def chain(i) # ... def motivation(predator, prey) # ... end

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class Song def initialize # ... def lyrics # ... private def verse(i) # ... def chain(i) # ... def motivation(predator, prey) # ... end class Verse # ... end

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class Verse def verse(i) # ... def chain(i) # ... def motivation(predator, prey) # ... end

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critters.last(i)

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class Verse def verse(i) # ... def chain(i) # ... def motivation(predator, prey) # ... end

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class Verse def initialize(critters) # ... def verse(i) # ... def chain(i) # ... def motivation(predator, prey) # ... end

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class Verse attr_reader :critters def initialize(critters) # ... def verse(i) # ... def chain(i) # ... def motivation(predator, prey) # ... end

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Verse.new(critters)

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Verse.new(critters.last(i))

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class Verse attr_reader :critters def initialize(critters) # ... def verse(i) # ... def chain(i) # ... def motivation(predator, prey) # ... end

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class Verse attr_reader :critters def initialize(critters) # ... def verse # ... def chain # ... def motivation(predator, prey) # ... end

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class Verse attr_reader :critters, :i def initialize(critters) @critters = critters @i = critters.length end # ... end

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Verse.new(critters.last(i)).verse

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Verse.new(critters.last(i)).to_s

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class Verse attr_reader :critters, :i def initialize(critters) # ... def to_s # ... def chain # ... def motivation(predator, prey) # ... end

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class Verse attr_reader :critters, i def initialize(critters) # ... def to_s # ... def chain # ... def motivation(predator, prey) # ... end

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class Verse attr_reader :critters, i def initialize(critters) # ... def to_s # ... private def chain # ... def motivation(predator, prey) # ... end

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class Song def initialize # ... def lyrics (1..8).map {|i| verse(i) }.join("\n") end private def verse(i) # ... def chain(i) # ... def motivation(predator, prey) # ... end

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class Song def initialize # ... def lyrics (1..8).map {|i| verse(i) }.join("\n") end private def verse(i) # ... def chain(i) # ... def motivation(predator, prey) # ... end

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class Song def initialize # ... def lyrics (1..8).map {|i| Verse.new(critters.last(i)) }.join("\n") end private def verse(i) # ... def chain(i) # ... def motivation(predator, prey) # ... end

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class Song def initialize # ... def lyrics (1..8).map {|i| Verse.new(critters.last(i)) }.join("\n") end end

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# Running: . 1 assertions, 0 failures, 0 errors, 0 skips

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class Verse attr_reader :critters, :i def initialize(critters) @critters = critters @i = critters.length end def to_s case i when 1, 8 "I know an old lady who swallowed a %s.\n" % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside else "I know an old lady who swallowed a %s.\n" % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." end end private def chain critters.last(i).each_cons(2).map {|pair| motivation(*pair) }.join("\n") end def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator.name, prey.epithet, ] end end class Critter < Struct.new(:name, :qualifier, :aside) def epithet [name, qualifier].compact.join(" ") end end class Song DATA = [ ["horse", nil, "She's dead, of course!"], ["cow", nil, "I don't know how she swallowed a cow!"], ["goat", nil, "Just opened her throat and swallowed a goat!"], ["dog", nil, "What a hog, to swallow a dog!"], ["cat", nil, "Imagine that, to swallow a cat!"], ["bird", nil, "How absurd to swallow a bird!"], [ "spider", "that wriggled and jiggled and tickled inside her", "It wriggled and jiggled and tickled inside her.", ], ["fly", nil, "I don't know why she swallowed the fly. Perhaps she'll die."], ] attr_reader :critters def initialize @critters = DATA.map {|row| Critter.new(*row)} end def lyrics (1..8).map {|i| Verse.new(critters.last(i)) }.join("\n") end end

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class Critter < Struct.new(:name, :qualifier, :aside) def epithet [name, qualifier].compact.join(" ") end end

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class Song DATA = [ ["horse", nil, "She's dead, of course!"], ["cow", nil, "I don't know how she swallowed a cow!"], ["goat", nil, "Just opened her throat and swallowed a goat!"], ["dog", nil, "What a hog, to swallow a dog!"], ["cat", nil, "Imagine that, to swallow a cat!"], ["bird", nil, "How absurd to swallow a bird!"], [ "spider", "that wriggled and jiggled and tickled inside her", "It wriggled and jiggled and tickled inside her.", ], ["fly", nil, "I don't know why she swallowed the fly. Perhaps she'll die."], ] attr_reader :critters def initialize @critters = DATA.map {|row| Critter.new(*row)} end def lyrics (1..8).map {|i| Verse.new(critters.last(i)) }.join("\n") end end

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class Verse attr_reader :critters, :i def initialize(critters) @critters = critters @i = critters.length end def to_s case i when 1, 8 "I know an old lady who swallowed a %s.\n" % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside else "I know an old lady who swallowed a %s.\n" % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." end end private def chain critters.last(i).each_cons(2).map {|pair| motivation(*pair) }.join("\n") end def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator.name, prey.epithet, ] end end

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SFTJEVF

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case i when 1, 8 "I know an old lady..." % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside else "I know an old lady..." % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." end

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case i when 1, 8 "I know an old lady..." % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside else "I know an old lady..." % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." end

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case i when 1, 8 "I know an old lady..." % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside else "I know an old lady..." % critters.last(i).first.name + "%s\n" % critters.last(i).first.aside + "%s\n" % chain + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." end

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case i when 1, 8 "" else "%s\n" % chain + "%s\n" % "I don't know why she swallowed..." end

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def summary case i when 1, 8 "" else "%s\n" % chain + "%s\n" % "I don't know why she swallowed..." end end

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def recap case i when 1, 8 "" else "%s\n" % chain + "%s\n" % "I don't know why she swallowed..." end end

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"I know an old lady who swallowed a %s.\n%s\n" % [ critters.last(i).first.name, critters.last(i).first.aside, ]

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def incident "I know an old lady who swallowed a %s.\n%s\n" % [ critters.last(i).first.name, critters.last(i).first.aside, ] end

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def to_s incident + recap end

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def incident "I know an old lady who swallowed a %s.\n%s\n" % [ critters.last(i).first.name, critters.last(i).first.aside, ] end def recap case i when 1, 8 "" else "%s\n" % chain + "%s\n" % "I don't know why she swallowed the fly..." end end

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def incident "I know an old lady who swallowed a %s.\n%s\n" % [ critters.last(i).first.name, critters.last(i).first.aside, ] end def chain critters.last(i).each_cons(2).map {|pair| motivation(*pair) }.join("\n") end

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def incident "I know an old lady who swallowed a %s.\n%s\n" % [ critters.first.name, critters.first.aside, ] end def chain critters.each_cons(2).map {|pair| motivation(*pair) }.join("\n") end

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attr_reader :critters, :i def initialize(critters) @critters = critters @i = critters.length end def to_s case i when 1, 8 # ... else # ... end end

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attr_reader :critters, :i def initialize(critters) @critters = critters @i = critters.length end def to_s case i when 1, 8 # ... else # ... end end

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attr_reader :critters def initialize(critters) @critters = critters end def to_s case critters.length when 1, 8 # ... else # ... end end

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attr_reader :critters def initialize(critters) @critters = critters end def incident "I know an old lady who swallowed a %s.\n%s\n" % [ critters.first.name, critters.first.aside, ] end

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attr_reader :critters def initialize(critters) @critters = critters end def incident "I know an old lady who swallowed a %s.\n%s\n" % [ critters.first.name, critters.first.aside, ] end

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attr_reader :critters, :critter def initialize(critters) @critters = critters @critter = critters.first end def incident "I know an old lady who swallowed a %s.\n%s\n" % [ critter.name, critter.aside, ] end

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def incident "I know an old lady who swallowed a %s.\n%s\n" % [ critter.name, critter.aside, ] end def recap case critters.length when 1, 8 "" else "%s\n" % chain + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." end end def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator.name, prey.epithet, ] end

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def incident "I know an old lady who swallowed a %s.\n%s\n" % [ critter.name, critter.aside, ] end def recap case critters.length when 1, 8 "" else "%s\n" % chain + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." end end def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator.name, prey.epithet, ] end

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def incident "I know an old lady who swallowed a %s.\n%s\n" % [ critter.name, critter.aside, ] end def recap case critters.length when 1, 8 "" else "%s\n" % chain + "%s\n" % "I don't know why she swallowed the fly. Perhaps she'll die." end end def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator.name, prey.epithet, ] end

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def incident "I know an old lady who swallowed a %s.\n%s\n" % [ critter.name, critter.aside, ] end def recap case critters.length when 1, 8 "" else "%s\n" % chain + "%s\n" % critters.last.aside end end def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator.name, prey.epithet, ] end

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class Verse attr_reader :critters, :critter def initialize(critters) @critters = critters @critter = critters.first end def to_s incident + recap end private def incident "I know an old lady who swallowed a %s.\n%s\n" % [ critter.name, critter.aside, ] end def recap case critters.length when 1, 8 "" else "%s\n" % chain + "%s\n" % critters.last.aside end end def chain critters.each_cons(2).map {|pair| motivation(*pair) }.join("\n") end def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator.name, prey.epithet, ] end end attr_reader :critters, :critter def initialize(critters) @critters = critters @critter = critters.first end

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def to_s incident + recap end class Verse attr_reader :critters, :critter def initialize(critters) @critters = critters @critter = critters.first end def to_s incident + recap end private def incident "I know an old lady who swallowed a %s.\n%s\n" % [ critter.name, critter.aside, ] end def recap case critters.length when 1, 8 "" else "%s\n" % chain + "%s\n" % critters.last.aside end end def chain critters.each_cons(2).map {|pair| motivation(*pair) }.join("\n") end def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator.name, prey.epithet, ] end end

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def incident "I know an old lady..." % [ critter.name, critter.aside, ] end class Verse attr_reader :critters, :critter def initialize(critters) @critters = critters @critter = critters.first end def to_s incident + recap end private def incident "I know an old lady who swallowed a %s.\n%s\n" % [ critter.name, critter.aside, ] end def recap case critters.length when 1, 8 "" else "%s\n" % chain + "%s\n" % critters.last.aside end end def chain critters.each_cons(2).map {|pair| motivation(*pair) }.join("\n") end def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator.name, prey.epithet, ] end end

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class Verse attr_reader :critters, :critter def initialize(critters) @critters = critters @critter = critters.first end def to_s incident + recap end private def incident "I know an old lady who swallowed a %s.\n%s\n" % [ critter.name, critter.aside, ] end def recap case critters.length when 1, 8 "" else "%s\n" % chain + "%s\n" % critters.last.aside end end def chain critters.each_cons(2).map {|pair| motivation(*pair) }.join("\n") end def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator.name, prey.epithet, ] end end def recap case critters.length when 1, 8 "" else "%s\n" % chain + "%s\n" % critters.last.aside end end

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def chain critters.each_cons(2).map {|pair| motivation(*pair) }.join("\n") end class Verse attr_reader :critters, :critter def initialize(critters) @critters = critters @critter = critters.first end def to_s incident + recap end private def incident "I know an old lady who swallowed a %s.\n%s\n" % [ critter.name, critter.aside, ] end def recap case critters.length when 1, 8 "" else "%s\n" % chain + "%s\n" % critters.last.aside end end def chain critters.each_cons(2).map {|pair| motivation(*pair) }.join("\n") end def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator.name, prey.epithet, ] end end

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def motivation(predator, prey) "... %s to catch the %s." % [ predator.name, prey.epithet, ] end class Verse attr_reader :critters, :critter def initialize(critters) @critters = critters @critter = critters.first end def to_s incident + recap end private def incident "I know an old lady who swallowed a %s.\n%s\n" % [ critter.name, critter.aside, ] end def recap case critters.length when 1, 8 "" else "%s\n" % chain + "%s\n" % critters.last.aside end end def chain critters.each_cons(2).map {|pair| motivation(*pair) }.join("\n") end def motivation(predator, prey) "She swallowed the %s to catch the %s." % [ predator.name, prey.epithet, ] end end

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QPMZNPSQIJTN

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OPQF

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DIBOHF

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class Song DATA = [...] # ... end

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class Song DATA = [...] def initialize @critters = DATA.map {|row| Critter.new(*row)} end # ... end

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class Song DATA = [...] def initialize(data=DATA) @critters = DATA.map {|row| Critter.new(*row)} end # ... end

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class Song DATA = [...] def initialize(data=DATA) @critters = data.map {|row| Critter.new(*row)} end # ... end

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def lyrics (1..8).map {|i| Verse.new(critters.last(i)) }.join("\n") end

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def lyrics (1..8).map {|i| Verse.new(critters.last(i)) }.join("\n") end

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def lyrics (1..critters.length).map {|i| Verse.new(critters.last(i)) }.join("\n") end

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class Verse # ... def recap case critters.length when 1, 8 "" else "%s\n" % chain + "%s\n" % critters.last.aside end end # ... end

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PQUJPOT

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Verse.new(critters.last(i))

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Verse.new(critters.last(i)) Verse.new(critters.last(i), critters.length)

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Verse.new(critters.last(i)) Verse.new(critters.last(i), critters.length) Verse.new(critters, i)

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Verse.new(critters.last(i)) Verse.new(critters.last(i), critters.length) Verse.new(critters, i) Verse.new(critters.last(i), :short)

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PQUJPOT

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QPMZNPSQIJTN

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class Verse # ... def recap case critters.length when 1, 8 "" else "%s\n" % chain + "%s\n" % critters.last.aside end end end

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class LongVerse # ... def recap end end class ShortVerse # ... def recap end end

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# else class LongVerse # ... def recap "%s\n" % chain + "%s\n" % critters.last.aside end end # when 1, 8 class ShortVerse # ... def recap "" end end

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# else class LongVerse # ... def recap "%s\n" % chain + "%s\n" % critters.last.aside end end # when 1, 8 class ShortVerse # ... def recap "" end end

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# else class LongVerse # ... def recap "%s\n" % chain + "%s\n" % critters.last.aside end def chain # ... def motivation(predator, prey) # ... end # when 1, 8 class ShortVerse # ... def recap "" end end

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class {Short,Long}Verse attr_reader :critters def initialize(critters) # ... def to_s # ... private def recap # ... end end

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class ShortVerse attr_reader :critters def initialize(critters) # ... def to_s # ... private def recap "" end end

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class LongVerse < ShortVerse end

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class LongVerse < ShortVerse private def recap "%s\n" % chain + "%s\n" % critters.last.aside end end

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class LongVerse < ShortVerse private def recap "%s\n" % chain + "%s\n" % critters.last.aside end def chain # ... def motivation(predator, prey) # ... end

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class Song # ... def lyrics (1..critters.length).map {|i| ???.???(critters, i) }.join("\n") end # ... end

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case i when 1, critters.length ShortVerse else LongVerse end

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case i when 1, critters.length ShortVerse else LongVerse end.new(critters.last(i))

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class Song def self.verse_builder(critters, i) case i when 1, critters.length ShortVerse else LongVerse end.new(critters.last(i)) end end

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class Verse def self.for(critters, i) case i when 1, critters.length ShortVerse else LongVerse end.new(critters.last(i)) end end

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class Song # ... def lyrics (1..critters.length).map {|i| Verse.for(critters, i) }.join("\n") end # ... end

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qFYJCJMJUZ

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data = [ ["D", nil, "Nope."], ["C", nil, "ZOMG C!"], ["B", "that blah blah", "Squee, B!"], ["A", nil, "IDK why A."], ]

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<<-SONG I know an old lady who swallowed an A. IDK why A. I know an old lady who swallowed a B. Squee, B! She swallowed the B to catch the A. IDK why A. I know an old lady who swallowed a C. ZOMG C! She swallowed the C to catch the B that blah blah. She swallowed the B to catch the A. IDK why A. I know an old lady who swallowed a D. Nope. SONG

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<<-SONG I know an old lady who swallowed an A. IDK why A. I know an old lady who swallowed a B. Squee, B! She swallowed the B to catch the A. IDK why A. I know an old lady who swallowed a C. ZOMG C! She swallowed the C to catch the B that blah blah. She swallowed the B to catch the A. IDK why A. I know an old lady who swallowed a D. Nope. SONG

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<<-SONG I know an old lady who swallowed an A. IDK why A. I know an old lady who swallowed a B. Squee, B! She swallowed the B to catch the A. IDK why A. I know an old lady who swallowed a C. ZOMG C! She swallowed the C to catch the B that blah blah. She swallowed the B to catch the A. IDK why A. I know an old lady who swallowed a D. Nope. SONG

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<<-SONG I know an old lady who swallowed an A. IDK why A. I know an old lady who swallowed a B. Squee, B! She swallowed the B to catch the A. IDK why A. I know an old lady who swallowed a C. ZOMG C! She swallowed the C to catch the B that blah blah. She swallowed the B to catch the A. IDK why A. I know an old lady who swallowed a D. Nope. SONG

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assert_equal expected, Song.new(data).lyrics

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1) Failure: SongTest#test_alt_critters [song_test.rb:90]: --- expected +++ actual @@ -1,4 +1,4 @@ -"I know an old lady who swallowed an A. +"I know an old lady who swallowed a A.

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[FCSB B

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BMMJHBUPS BO

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class Critter < Struct.new(:name, :qualifier, :aside) def epithet [name, qualifier].compact.join(" ") end def article if name[0] =~ /[aeiouAEIOU]/ "an" else "a" end end end

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# Running: .. 2 assertions, 0 failures, 0 errors, 0 skips

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UIFONBLFUIFFBTZDIBOHF - Kent Beck NBLFUIFDIBOHFFBTZ XBSOJOHUIJTNBZCFIBSE

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SFGBDUPSJOH is insight

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UIBOLZPV

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HJUIVCDPNLZUSJOZY succession

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Katrina Owen Sandi Metz & by CPUUMFTCPPLDPN

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FYFSDJTN JP IUUQ

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Katrina Owen FYFSDJTNJP !LZUSJOZY

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UIBOLT <3