languages.rb

gistfile1.txt

require 'minitest/autorun'

describe "LanguageSolver" do
  let (:solver) { LanguageSolver.new }
  it "should generate pairs for comparison" do
    solver.pairs(['ccda','ccbk', 'cd', 'a', 'ab', 'abd', 'aba'])
      .must_equal([['d','b'],['c','d'],['c','a'],['d','a']])
  end
end

class LanguageSolver
  def pairs(ary)
    pairs = []
    ary[1..-1].each_with_index do |word, i|
      puts
      (0...word.size).each do |j|
        puts "comparing #{ary[i-1][j]}, #{word[j]}"
        if ary[i-1][j] == word[j] || ary.size <= j
          next
        end
        puts "found difference"
        pairs << [ary[i-1][j], word[j]]
        break
      end
    end

    pairs
  end
end