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kmcgrevey's solution

to Scrabble Score in the Ruby Track

Published at Sep 22 2020 · 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``````
``````class Scrabble
def initialize(word)
@word = word
end

def score
return 0 if @word == nil
ratings = {
'a' => 1,
'e' => 1,
'i' => 1,
'o' => 1,
'u' => 1,
'l' => 1,
'n' => 1,
'r' => 1,
's' => 1,
't' => 1,
'd' => 2,
'g' => 2,
'b' => 3,
'c' => 3,
'm' => 3,
'p' => 3,
'f' => 4,
'h' => 4,
'v' => 4,
'w' => 4,
'y' => 4,
'k' => 5,
'j' => 8,
'x' => 8,
'q' => 10,
'z' => 10
}
total_score = @word.chars.map do |letter|
(('a'..'z').include? letter.downcase) ? ratings[letter.downcase] : 0
end
total_score.sum
end

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