ruby - anagram

ruby/anagram/README.md

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+# Anagram
+
+Given a word and a list of possible anagrams, select the correct sublist.
+
+Given `"listen"` and a list of candidates like `"enlists" "google"
+"inlets" "banana"` the program should return a list containing
+`"inlets"`.
+
+* * * *
+
+For installation and learning resources, refer to the
+[Ruby resources page](http://exercism.io/languages/ruby/resources).
+
+For running the tests provided, you will need the Minitest gem. Open a
+terminal window and run the following command to install minitest:
+
+    gem install minitest
+
+If you would like color output, you can `require 'minitest/pride'` in
+the test file, or note the alternative instruction, below, for running
+the test file.
+
+Run the tests from the exercise directory using the following command:
+
+    ruby anagram_test.rb
+
+To include color from the command line:
+
+    ruby -r minitest/pride anagram_test.rb
+
+
+## Source
+
+Inspired by the Extreme Startup game [https://github.com/rchatley/extreme_startup](https://github.com/rchatley/extreme_startup)
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

ruby/anagram/anagram.rb

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+# Anagram class
+class Anagram
+  def initialize(word)
+    @word = word.downcase
+    @sorted = @word.chars.sort.join
+  end
+
+  def match(candidates)
+    candidates.map do |candidate|
+      sorted_candidate = candidate.downcase.chars.sort.join
+      candidate if @sorted == sorted_candidate && @word != candidate.downcase
+    end.compact.sort
+  end
+end

ruby/anagram/anagram_test.rb

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+require 'minitest/autorun'
+require_relative 'anagram'
+
+# Common test data version: 1.4.0 baaf092
+class AnagramTest < Minitest::Test
+  def test_no_matches
+    # skip
+    detector = Anagram.new('diaper')
+    anagrams = detector.match(["hello", "world", "zombies", "pants"])
+    expected = []
+    assert_equal expected, anagrams
+  end
+
+  def test_detects_two_anagrams
+    # skip
+    detector = Anagram.new('master')
+    anagrams = detector.match(["stream", "pigeon", "maters"])
+    expected = ["maters", "stream"]
+    assert_equal expected, anagrams.sort
+  end
+
+  def test_does_not_detect_anagram_subsets
+    # skip
+    detector = Anagram.new('good')
+    anagrams = detector.match(["dog", "goody"])
+    expected = []
+    assert_equal expected, anagrams
+  end
+
+  def test_detects_anagram
+    # skip
+    detector = Anagram.new('listen')
+    anagrams = detector.match(["enlists", "google", "inlets", "banana"])
+    expected = ["inlets"]
+    assert_equal expected, anagrams
+  end
+
+  def test_detects_three_anagrams
+    # skip
+    detector = Anagram.new('allergy')
+    anagrams = detector.match(["gallery", "ballerina", "regally", "clergy", "largely", "leading"])
+    expected = ["gallery", "largely", "regally"]
+    assert_equal expected, anagrams.sort
+  end
+
+  def test_does_not_detect_non_anagrams_with_identical_checksum
+    # skip
+    detector = Anagram.new('mass')
+    anagrams = detector.match(["last"])
+    expected = []
+    assert_equal expected, anagrams
+  end
+
+  def test_detects_anagrams_case_insensitively
+    # skip
+    detector = Anagram.new('Orchestra')
+    anagrams = detector.match(["cashregister", "Carthorse", "radishes"])
+    expected = ["Carthorse"]
+    assert_equal expected, anagrams
+  end
+
+  def test_detects_anagrams_using_case_insensitive_subject
+    # skip
+    detector = Anagram.new('Orchestra')
+    anagrams = detector.match(["cashregister", "carthorse", "radishes"])
+    expected = ["carthorse"]
+    assert_equal expected, anagrams
+  end
+
+  def test_detects_anagrams_using_case_insensitive_possible_matches
+    # skip
+    detector = Anagram.new('orchestra')
+    anagrams = detector.match(["cashregister", "Carthorse", "radishes"])
+    expected = ["Carthorse"]
+    assert_equal expected, anagrams
+  end
+
+  def test_does_not_detect_a_anagram_if_the_original_word_is_repeated
+    # skip
+    detector = Anagram.new('go')
+    anagrams = detector.match(["go Go GO"])
+    expected = []
+    assert_equal expected, anagrams
+  end
+
+  def test_anagrams_must_use_all_letters_exactly_once
+    # skip
+    detector = Anagram.new('tapper')
+    anagrams = detector.match(["patter"])
+    expected = []
+    assert_equal expected, anagrams
+  end
+
+  def test_words_are_not_anagrams_of_themselves_case_insensitive
+    # skip
+    detector = Anagram.new('BANANA')
+    anagrams = detector.match(["BANANA", "Banana", "banana"])
+    expected = []
+    assert_equal expected, anagrams
+  end
+end