ruby - high-scores

ruby/high-scores/README.md

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+# High Scores
+
+Manage a game player's High Score list.
+
+Your task is to build a high-score component of the classic Frogger game, one of the highest selling and addictive games of all time, and a classic of the arcade era. Your task is to write methods that return the highest score from the list, the last added score, the three highest scores, and a report on the difference between the last and the highest scores. 
+
+In this exercise you're going to instantiate a class and add some instance methods. http://ruby-for-beginners.rubymonstas.org/writing_classes/initializers.html
+
+A HighScore accepts an array with one or more numbers, each representing one 'game score'. The Array class can offer inspiration for working with arrays. https://ruby-doc.org/core-2.5.1/Array.html
+
+* * * *
+
+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 high_scores_test.rb
+
+To include color from the command line:
+
+    ruby -r minitest/pride high_scores_test.rb
+
+
+## Source
+
+Tribute to the eighties' arcade game Frogger
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

ruby/high-scores/high_scores.rb

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+# High Scores class
+class HighScores
+  attr_accessor :scores
+
+  def initialize(scores)
+    @scores = scores
+  end
+
+  def latest
+    @scores.last
+  end
+
+  def highest
+    @scores.max
+  end
+
+  def top
+    @scores.sort{ |a, b| b <=> a }[0, 3]
+  end
+
+  def report
+    short_of = "#{highest - latest} short of " if highest != latest
+    "Your latest score was #{latest}. That's #{short_of}your personal best!"
+  end
+end

ruby/high-scores/high_scores_test.rb

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+require 'minitest/autorun'
+require_relative 'high_scores'
+
+# Common test data version: 1.0.0 3204fc2
+class HighScoresTest < Minitest::Test
+  def test_list_of_scores
+    # skip
+    scores = [30, 50, 20, 70]
+    expected = [30, 50, 20, 70]
+    assert_equal expected, HighScores.new(scores).scores
+  end
+
+  def test_latest_score
+    # skip
+    scores = [100, 0, 90, 30]
+    expected = 30
+    assert_equal expected, HighScores.new(scores).latest
+  end
+
+  def test_highest_score
+    # skip
+    scores = [40, 100, 70]
+    expected = 100
+    assert_equal expected, HighScores.new(scores).highest
+  end
+
+  def test_personal_bests
+    # skip
+    scores = [50, 30, 10]
+    expected = [50, 30, 10]
+    assert_equal expected, HighScores.new(scores).top
+  end
+
+  def test_personal_bests_highest_to_lowest
+    # skip
+    scores = [20, 10, 30]
+    expected = [30, 20, 10]
+    assert_equal expected, HighScores.new(scores).top
+  end
+
+  def test_personal_bests_when_there_is_a_tie
+    # skip
+    scores = [40, 20, 40, 30]
+    expected = [40, 40, 30]
+    assert_equal expected, HighScores.new(scores).top
+  end
+
+  def test_personal_bests_when_there_are_less_than_3
+    # skip
+    scores = [30, 70]
+    expected = [70, 30]
+    assert_equal expected, HighScores.new(scores).top
+  end
+
+  def test_personal_bests_when_there_is_only_one
+    # skip
+    scores = [40]
+    expected = [40]
+    assert_equal expected, HighScores.new(scores).top
+  end
+
+  def test_personal_bests_from_a_long_list
+    # skip
+    scores = [10, 30, 90, 30, 100, 20, 10, 0, 30, 40, 40, 70, 70]
+    expected = [100, 90, 70]
+    assert_equal expected, HighScores.new(scores).top
+  end
+
+  def test_message_for_new_personal_best
+    # skip
+    scores = [20, 40, 0, 30, 70]
+    expected = "Your latest score was 70. That's your personal best!"
+    assert_equal expected, HighScores.new(scores).report
+  end
+
+  def test_message_when_latest_score_is_not_the_highest_score
+    # skip
+    scores = [20, 100, 0, 30, 70]
+    expected = "Your latest score was 70. That's 30 short of your personal best!"
+    assert_equal expected, HighScores.new(scores).report
+  end
+
+  def test_message_for_repeated_personal_best
+    # skip
+    scores = [20, 70, 50, 70, 30]
+    expected = "Your latest score was 30. That's 40 short of your personal best!"
+    assert_equal expected, HighScores.new(scores).report
+  end
+end