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PatrickMcSweeny's solution

to Pangram in the Ruby Track

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Instructions
Test suite
Solution

Determine if a sentence is a pangram. A pangram (Greek: παν γράμμα, pan gramma, "every letter") is a sentence using every letter of the alphabet at least once. The best known English pangram is:

The quick brown fox jumps over the lazy dog.

The alphabet used consists of ASCII letters a to z, inclusive, and is case insensitive. Input will not contain non-ASCII symbols.


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 pangram_test.rb

To include color from the command line:

ruby -r minitest/pride pangram_test.rb

Source

Wikipedia https://en.wikipedia.org/wiki/Pangram

Submitting Incomplete Solutions

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

pangram_test.rb

require 'minitest/autorun'
require_relative 'pangram'

# Common test data version: 1.4.1 2c020bc
class PangramTest < Minitest::Test
  def test_sentence_empty
    # skip
    sentence = ''
    result = Pangram.pangram?(sentence)
    refute result, "Expected false, got: #{result.inspect}. #{sentence.inspect} is NOT a pangram"
  end

  def test_recognizes_a_perfect_lower_case_pangram
    skip
    sentence = 'abcdefghijklmnopqrstuvwxyz'
    result = Pangram.pangram?(sentence)
    assert result, "Expected true, got: #{result.inspect}. #{sentence.inspect} IS a pangram"
  end

  def test_pangram_with_only_lower_case
    skip
    sentence = 'the quick brown fox jumps over the lazy dog'
    result = Pangram.pangram?(sentence)
    assert result, "Expected true, got: #{result.inspect}. #{sentence.inspect} IS a pangram"
  end

  def test_missing_character_x
    skip
    sentence = 'a quick movement of the enemy will jeopardize five gunboats'
    result = Pangram.pangram?(sentence)
    refute result, "Expected false, got: #{result.inspect}. #{sentence.inspect} is NOT a pangram"
  end

  def test_missing_character_h
    skip
    sentence = 'five boxing wizards jump quickly at it'
    result = Pangram.pangram?(sentence)
    refute result, "Expected false, got: #{result.inspect}. #{sentence.inspect} is NOT a pangram"
  end

  def test_pangram_with_underscores
    skip
    sentence = 'the_quick_brown_fox_jumps_over_the_lazy_dog'
    result = Pangram.pangram?(sentence)
    assert result, "Expected true, got: #{result.inspect}. #{sentence.inspect} IS a pangram"
  end

  def test_pangram_with_numbers
    skip
    sentence = 'the 1 quick brown fox jumps over the 2 lazy dogs'
    result = Pangram.pangram?(sentence)
    assert result, "Expected true, got: #{result.inspect}. #{sentence.inspect} IS a pangram"
  end

  def test_missing_letters_replaced_by_numbers
    skip
    sentence = '7h3 qu1ck brown fox jumps ov3r 7h3 lazy dog'
    result = Pangram.pangram?(sentence)
    refute result, "Expected false, got: #{result.inspect}. #{sentence.inspect} is NOT a pangram"
  end

  def test_pangram_with_mixed_case_and_punctuation
    skip
    sentence = '"Five quacking Zephyrs jolt my wax bed."'
    result = Pangram.pangram?(sentence)
    assert result, "Expected true, got: #{result.inspect}. #{sentence.inspect} IS a pangram"
  end

  def test_upper_and_lower_case_versions_of_the_same_character_should_not_be_counted_separately
    skip
    sentence = 'the quick brown fox jumps over with lazy FX'
    result = Pangram.pangram?(sentence)
    refute result, "Expected false, got: #{result.inspect}. #{sentence.inspect} is NOT a pangram"
  end
end
class Pangram
  ALPHABET = %w[a b c d e f g h i j k l m n o p q r s t u v w x y z].freeze

  def self.pangram?(phrase)
    downcase_phrase = phrase.downcase
    ALPHABET.reject { |char| downcase_phrase.include? char }.empty?
  end
end

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