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lujanfernaud's solution

to Anagram in the Ruby Track

Published at Mar 23 2019 · 0 comments
Instructions
Test suite
Solution

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.

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

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.

anagram_test.rb

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
class Anagram
  def initialize(word)
    @word = word
  end

  def match(candidates)
    candidates.select { |candidate| anagram?(candidate) }
  end

  private

  def anagram?(candidate)
    !candidate.casecmp(word).zero? && chars_for(candidate) == chars_for(word)
  end

  def chars_for(word)
    word.downcase.chars.sort
  end

  attr_reader :word
end

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