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PatrickMcSweeny's solution

to Word Count in the Ruby Track

Published at Oct 20 2018 · 0 comments
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 :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
end

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