Given a phrase, count the occurrences of each word in that phrase.
For example for the input "olly olly in come free"
olly: 2
in: 1
come: 1
free: 1
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 word_count_test.rb
To include color from the command line:
ruby -r minitest/pride word_count_test.rb
This is a classic toy problem, but we were reminded of it by seeing it in the Go Tour.
It's possible to submit an incomplete solution so you can see how others have completed the exercise.
require 'minitest/autorun'
require_relative 'word_count'
# Common test data version: 1.2.0 77623ec
class WordCountTest < Minitest::Test
def test_count_one_word
# skip
phrase = Phrase.new("word")
counts = {"word"=>1}
assert_equal counts, phrase.word_count
end
def test_count_one_of_each_word
skip
phrase = Phrase.new("one of each")
counts = {"one"=>1, "of"=>1, "each"=>1}
assert_equal counts, phrase.word_count
end
def test_multiple_occurrences_of_a_word
skip
phrase = Phrase.new("one fish two fish red fish blue fish")
counts = {"one"=>1, "fish"=>4, "two"=>1, "red"=>1, "blue"=>1}
assert_equal counts, phrase.word_count
end
def test_handles_cramped_lists
skip
phrase = Phrase.new("one,two,three")
counts = {"one"=>1, "two"=>1, "three"=>1}
assert_equal counts, phrase.word_count
end
def test_handles_expanded_lists
skip
phrase = Phrase.new("one,\ntwo,\nthree")
counts = {"one"=>1, "two"=>1, "three"=>1}
assert_equal counts, phrase.word_count
end
def test_ignore_punctuation
skip
phrase = Phrase.new("car: carpet as java: javascript!!&@$%^&")
counts = {"car"=>1, "carpet"=>1, "as"=>1, "java"=>1, "javascript"=>1}
assert_equal counts, phrase.word_count
end
def test_include_numbers
skip
phrase = Phrase.new("testing, 1, 2 testing")
counts = {"testing"=>2, "1"=>1, "2"=>1}
assert_equal counts, phrase.word_count
end
def test_normalize_case
skip
phrase = Phrase.new("go Go GO Stop stop")
counts = {"go"=>3, "stop"=>2}
assert_equal counts, phrase.word_count
end
def test_with_apostrophes
skip
phrase = Phrase.new("First: don't laugh. Then: don't cry.")
counts = {"first"=>1, "don't"=>2, "laugh"=>1, "then"=>1, "cry"=>1}
assert_equal counts, phrase.word_count
end
def test_with_quotations
skip
phrase = Phrase.new("Joe can't tell between 'large' and large.")
counts = {"joe"=>1, "can't"=>1, "tell"=>1, "between"=>1, "large"=>2, "and"=>1}
assert_equal counts, phrase.word_count
end
def test_multiple_spaces_not_detected_as_a_word
skip
phrase = Phrase.new(" multiple whitespaces")
counts = {"multiple"=>1, "whitespaces"=>1}
assert_equal counts, phrase.word_count
end
endclass Phrase
attr_accessor :word_count
def initialize(phrase)
@word_count = {}
words = phrase.downcase.scan /\b[\w\']+\b/
words.uniq.each do |word|
word_count[word] = words.count(word)
end
end
endA huge amount can be learnt from reading other people’s code. This is why we wanted to give exercism users the option of making their solutions public.
Here are some questions to help you reflect on this solution and learn the most from it.