Created
April 15, 2016 05:27
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| class FoodChain | |
| VERSION = 2 | |
| def self.song | |
| 0.upto(7).map { |n| FoodChainStanza.nth(n) }.join("\n") | |
| end | |
| end | |
| class FoodChainStanza | |
| ANIMALS = %w(fly spider bird cat dog goat cow horse) | |
| SENTENCES = [ | |
| "", | |
| "It wriggled and jiggled and tickled inside her.\n", | |
| "How absurd to swallow a bird!\n", | |
| "Imagine that, to swallow a cat!\n", | |
| "What a hog, to swallow a dog!\n", | |
| "Just opened her throat and swallowed a goat!\n", | |
| "I don't know how she swallowed a cow!\n", | |
| "She's dead, of course!\n" | |
| ] | |
| def self.nth(n) | |
| self.new(n).to_s | |
| end | |
| def initialize(n) | |
| @n = n | |
| end | |
| def to_s | |
| result = intro | |
| result << continuation if @n < 7 | |
| result | |
| end | |
| private | |
| def intro | |
| result = "I know an old lady who swallowed a #{ANIMALS[@n]}.\n" | |
| result << SENTENCES[@n] | |
| end | |
| def continuation | |
| result = @n.downto(1).map { |i| middle_sentence(i) }.join | |
| result << ending | |
| end | |
| def middle_sentence(i) | |
| result = "She swallowed the #{ANIMALS[i]} to catch the #{ANIMALS[i - 1]}" | |
| result << ' that wriggled and jiggled and tickled inside her' if i == 2 | |
| result << ".\n" | |
| end | |
| def ending | |
| "I don't know why she swallowed the fly. Perhaps she'll die.\n" | |
| end | |
| end |
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