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## to Scrabble Score in the Ruby Track

Published at Mar 27 2019 · 0 comments
Instructions
Test suite
Solution

Given a word, compute the scrabble score for that word.

## Letter Values

You'll need these:

``````Letter                           Value
A, E, I, O, U, L, N, R, S, T       1
D, G                               2
B, C, M, P                         3
F, H, V, W, Y                      4
K                                  5
J, X                               8
Q, Z                               10
``````

## Examples

"cabbage" should be scored as worth 14 points:

• 3 points for C
• 1 point for A, twice
• 3 points for B, twice
• 2 points for G
• 1 point for E

And to total:

• `3 + 2*1 + 2*3 + 2 + 1`
• = `3 + 2 + 6 + 3`
• = `5 + 9`
• = 14

## Extensions

• You can play a double or a triple letter.
• You can play a double or a triple word.

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 scrabble_score_test.rb
``````

To include color from the command line:

``````ruby -r minitest/pride scrabble_score_test.rb
``````

## Source

Inspired by the Extreme Startup game https://github.com/rchatley/extreme_startup

## Submitting Incomplete Solutions

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

### scrabble_score_test.rb

``````require 'minitest/autorun'
require_relative 'scrabble_score'

class ScrabbleTest < Minitest::Test
def test_empty_word_scores_zero
assert_equal 0, Scrabble.new('').score
end

def test_whitespace_scores_zero
skip
assert_equal 0, Scrabble.new(" \t\n").score
end

def test_nil_scores_zero
skip
assert_equal 0, Scrabble.new(nil).score
end

def test_scores_very_short_word
skip
assert_equal 1, Scrabble.new('a').score
end

def test_scores_other_very_short_word
skip
assert_equal 4, Scrabble.new('f').score
end

def test_simple_word_scores_the_number_of_letters
skip
assert_equal 6, Scrabble.new('street').score
end

def test_complicated_word_scores_more
skip
assert_equal 22, Scrabble.new('quirky').score
end

def test_scores_are_case_insensitive
skip
assert_equal 41, Scrabble.new('OXYPHENBUTAZONE').score
end

def test_convenient_scoring
skip
assert_equal 13, Scrabble.score('alacrity')
end
end``````

### scrabble_score.rb

``````class Scrabble
SCORES = {
1  => %w[A E I O U L N R S T],
2  => %w[D G],
3  => %w[B C M P],
4  => %w[F H V W Y],
5  => %w[K],
8  => %w[J X],
10 => %w[Q Z]
}

def self.score(word)
new(word).score
end

def initialize(word)
@word = word || ""
end

def score
letters.sum(&method(:to_score))
end

private

def letters
@word.upcase.scan(/[A-Z]/)
end

def to_score(letter)
SCORES.find { |_key, value| value.include?(letter) }.first
end
end``````

### scrabble_score_test.rb

``````require 'minitest/autorun'
require_relative 'scrabble_score'

class ScrabbleTest < Minitest::Test
def test_empty_word_scores_zero
assert_equal 0, Scrabble.new('').score
end

def test_whitespace_scores_zero
# skip
assert_equal 0, Scrabble.new(" \t\n").score
end

def test_nil_scores_zero
# skip
assert_equal 0, Scrabble.new(nil).score
end

def test_scores_very_short_word
# skip
assert_equal 1, Scrabble.new('a').score
end

def test_scores_other_very_short_word
# skip
assert_equal 4, Scrabble.new('f').score
end

def test_simple_word_scores_the_number_of_letters
# skip
assert_equal 6, Scrabble.new('street').score
end

def test_complicated_word_scores_more
# skip
assert_equal 22, Scrabble.new('quirky').score
end

def test_scores_are_case_insensitive
# skip
assert_equal 41, Scrabble.new('OXYPHENBUTAZONE').score
end

def test_convenient_scoring
# skip
assert_equal 13, Scrabble.score('alacrity')
end

def test_skips_numbers_and_underscores
# skip
assert_equal 13, Scrabble.score('12 ala_crity')
end
end``````

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