Simple Unique Exercism Iterations Algorithm

example.rb

require 'similar_text'

def unique_iterations(iterations)
  unique_enough = [iterations.first]
  unique_enough << iterations[1..-1].select do |iteration_filename|
    iteration = File.read iteration_filename
    similar_iterations = unique_enough.select do |unique_filename|
      similarity = iteration.similar(File.read(unique_filename))
      similarity < 50
    end
    similar_iterations.count != 0
  end
end

iterations = (1..6).map do |num|
  "iteration#{num}.rb"
end
puts unique_iterations iterations
# OUTPUT
# iteration1.rb
# iteration6.rb

Gemfile

source "https://rubygems.org"

gem 'similar_text'

iteration1.rb

class Bob
  def hey(message)
    if message.match(/^\s*\Z/)
      'Fine. Be that way!'
    elsif message.match(/[A-Z]/) and message.upcase == message
      'Woah, chill out!'
    elsif message.match(/\?\Z/)
      'Sure.'
    else
      'Whatever.'
    end
  end
end

iteration2.rb

class Bob
  def hey(message)
    # address without saying anything
    if message.match(/^\s*\Z/)
      'Fine. Be that way!'
      # yell at
    elsif message.match(/[A-Z]/) and message.upcase == message
      'Woah, chill out!'
      # ask a question
    elsif message.match(/\?\Z/)
      'Sure.'
      # everything else
    else
      'Whatever.'
    end
  end
end

iteration3.rb

class Bob
  def hey(message)
    # address without saying anything
    if message =~ /^\s*\Z/
      'Fine. Be that way!'
      # yell at
    elsif message =~ /[A-Z]/ and message.upcase == message
      'Woah, chill out!'
      # ask a question
    elsif message =~ /\?\Z/
      'Sure.'
      # everything else
    else
      'Whatever.'
    end
  end
end

iteration4.rb

class Bob
  def hey(message)
    # address without saying anything
    if message.strip.empty?
      'Fine. Be that way!'
      # yell at
    elsif message =~ /[A-Z]/ and message.upcase == message
      'Woah, chill out!'
      # ask a question
    elsif message.end_with?('?')
      'Sure.'
      # everything else
    else
      'Whatever.'
    end
  end
end

iteration5.rb

class Bob
  def hey(message)
    # address without saying anything
    if message.strip.empty?
      'Fine. Be that way!'
      # yell at
    elsif message.downcase != message and message.upcase == message
      'Woah, chill out!'
      # ask a question
    elsif message.end_with?('?')
      'Sure.'
      # everything else
    else
      'Whatever.'
    end
  end
end

iteration6.rb

class Bob
  attr_reader :cerebrum

  def initialize
    @cerebrum = Cerebrum.new
  end

  def hey(message)
    cerebrum.process(message)
  end
end

class Cerebrum
  def process(input)
    case detect_sentiment(input)
    when :silence
      'Fine. Be that way!'
    when :yelling
      'Woah, chill out!'
    when :questioning
      'Sure.'
    when :whocares
      'Whatever.'
    end
  end

  def detect_sentiment(input)
    if input.strip.empty?
      :silence
    elsif input.downcase != input and input.upcase == input
      :yelling
    elsif input.end_with?('?')
      :questioning
    else
      :whocares
    end
  end
end