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
Wikipedia https://en.wikipedia.org/wiki/Pangram
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
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
def self.pangram?(sentence)
alphabet = ('a'..'z').to_a
pangram = []
sentence.chars.each do |char|
char = char.downcase
if alphabet.include?(char) and not pangram.include?(char)
pangram.push(char)
end
end
pangram.sort == alphabet
end
end
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