words.rb

require 'minitest/autorun'

class TestWords <  Minitest::Test
	def test_that_similar_words_are_found
		assert_equal one_off_words("moor", ["door", "moot", "boot", "boots"]), ["door", "moot"]
	end

	def test_fake_failure
		assert_equal one_off_words("moor", ["door", "moot", "boot", "boots"]), ["door", "moot", "fuckers"]
	end
end

def one_off_words(str, word_list)
	word_list.select do |word|
		if word.size == str.size
			compare_chars = (0...word.size).map {|i| word[i] == str[i]}
			compare_chars.count(false) == 1
		end
	end
end