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 exercism help 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: 1.3.0 d79e13e
class PangramTest < Minitest::Test
def test_sentence_empty
# skip
phrase = ''
result = Pangram.pangram?(phrase)
refute result, "Expected false, got: #{result.inspect}. #{phrase.inspect} is NOT a pangram"
end
def test_recognizes_a_perfect_lower_case_pangram
skip
phrase = 'abcdefghijklmnopqrstuvwxyz'
result = Pangram.pangram?(phrase)
assert result, "Expected true, got: #{result.inspect}. #{phrase.inspect} IS a pangram"
end
def test_pangram_with_only_lower_case
skip
phrase = 'the quick brown fox jumps over the lazy dog'
result = Pangram.pangram?(phrase)
assert result, "Expected true, got: #{result.inspect}. #{phrase.inspect} IS a pangram"
end
def test_missing_character_x
skip
phrase = 'a quick movement of the enemy will jeopardize five gunboats'
result = Pangram.pangram?(phrase)
refute result, "Expected false, got: #{result.inspect}. #{phrase.inspect} is NOT a pangram"
end
def test_another_missing_character_eg_h
skip
phrase = 'five boxing wizards jump quickly at it'
result = Pangram.pangram?(phrase)
refute result, "Expected false, got: #{result.inspect}. #{phrase.inspect} is NOT a pangram"
end
def test_pangram_with_underscores
skip
phrase = 'the_quick_brown_fox_jumps_over_the_lazy_dog'
result = Pangram.pangram?(phrase)
assert result, "Expected true, got: #{result.inspect}. #{phrase.inspect} IS a pangram"
end
def test_pangram_with_numbers
skip
phrase = 'the 1 quick brown fox jumps over the 2 lazy dogs'
result = Pangram.pangram?(phrase)
assert result, "Expected true, got: #{result.inspect}. #{phrase.inspect} IS a pangram"
end
def test_missing_letters_replaced_by_numbers
skip
phrase = '7h3 qu1ck brown fox jumps ov3r 7h3 lazy dog'
result = Pangram.pangram?(phrase)
refute result, "Expected false, got: #{result.inspect}. #{phrase.inspect} is NOT a pangram"
end
def test_pangram_with_mixed_case_and_punctuation
skip
phrase = '"Five quacking Zephyrs jolt my wax bed."'
result = Pangram.pangram?(phrase)
assert result, "Expected true, got: #{result.inspect}. #{phrase.inspect} IS a pangram"
end
def test_upper_and_lower_case_versions_of_the_same_character_should_not_be_counted_separately
skip
phrase = 'the quick brown fox jumps over with lazy FX'
result = Pangram.pangram?(phrase)
refute result, "Expected false, got: #{result.inspect}. #{phrase.inspect} is NOT a pangram"
end
# Problems in exercism evolve over time, as we find better ways to ask
# questions.
# The version number refers to the version of the problem you solved,
# not your solution.
#
# Define a constant named VERSION inside of the top level BookKeeping
# module, which may be placed near the end of your file.
#
# In your file, it will look like this:
#
# module BookKeeping
# VERSION = 1 # Where the version number matches the one in the test.
# end
#
# If you are curious, read more about constants on RubyDoc:
# http://ruby-doc.org/docs/ruby-doc-bundle/UsersGuide/rg/constants.html
def test_bookkeeping
skip
assert_equal 6, BookKeeping::VERSION
end
end
module BookKeeping
VERSION = 4
end
class Pangram
class << self
ALPHABET = ('a'..'z').to_a
def pangram?(string)
(ALPHABET - string.downcase.chars).length.zero?
end
end
end
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Community comments
In line 10 you could use .empty? instead of .length.zero?