PatrickMcSweeny's solution to Word Count on the Ruby track

Instructions

Test suite

Solution

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

Source

This is a classic toy problem, but we were reminded of it by seeing it in the Go Tour.

Submitting Incomplete Solutions

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

word_count_test.rb

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
end

class Phrase
  attr_reader :words

  def initialize(phrase)
    @words = phrase.downcase.scan /\b[\w\']+\b/
  end

  def word_count
    words.uniq.each_with_object({}) do |word, word_count|
      word_count[word] = words.count(word)
    end
  end
end

Community comments

Find this solution interesting? Ask the author a question to learn more.

What can you learn from this solution?

A huge amount can be learned 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.

What compromises have been made?
Are there new concepts here that you could read more about to improve your understanding?

PatrickMcSweeny's solution

to Word Count in the Ruby Track

Source

Submitting Incomplete Solutions

word_count_test.rb

Community comments

What can you learn from this solution?

New to Exercism?