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# thekeele's solution

## to Scrabble Score in the Elixir Track

Published at May 23 2019 · 0 comments
Instructions
Test suite
Solution

#### Note:

This exercise has changed since this solution was written.

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.

## Running tests

Execute the tests with:

``````\$ elixir scrabble_score_test.exs
``````

### Pending tests

In the test suites, all but the first test have been skipped.

Once you get a test passing, you can unskip the next one by commenting out the relevant `@tag :pending` with a `#` symbol.

For example:

``````# @tag :pending
test "shouting" do
assert Bob.hey("WATCH OUT!") == "Whoa, chill out!"
end
``````

Or, you can enable all the tests by commenting out the `ExUnit.configure` line in the test suite.

``````# ExUnit.configure exclude: :pending, trace: true
``````

If you're stuck on something, it may help to look at some of the available resources out there where answers might be found.

## 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.exs

``````if !System.get_env("EXERCISM_TEST_EXAMPLES") do
Code.load_file("scrabble.exs", __DIR__)
end

ExUnit.start()
ExUnit.configure(exclude: :pending, trace: true)

defmodule ScrabbleScoreTest do
use ExUnit.Case

# @tag :pending
test "empty word scores zero" do
assert Scrabble.score("") == 0
end

@tag :pending
test "whitespace scores zero" do
assert Scrabble.score(" \t\n") == 0
end

@tag :pending
test "scores very short word" do
assert Scrabble.score("a") == 1
end

@tag :pending
test "scores other very short word" do
assert Scrabble.score("f") == 4
end

@tag :pending
test "simple word scores the number of letters" do
assert Scrabble.score("street") == 6
end

@tag :pending
test "complicated word scores more" do
assert Scrabble.score("quirky") == 22
end

@tag :pending
test "scores are case insensitive" do
assert Scrabble.score("OXYPHENBUTAZONE") == 41
end

@tag :pending
test "convenient scoring" do
assert Scrabble.score("alacrity") == 13
end
end``````
``````defmodule Scrabble do

@letter_values %{
"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,
}

@spec score(String.t()) :: non_neg_integer
def score(""),
do: 0
def score(<<letter::binary-size(1)>>),
do: Map.get(@letter_values, String.upcase(letter), 0)
def score(<<letter::binary-size(1), rest::binary()>>),
do: Map.get(@letter_values, String.upcase(letter), 0) + score(rest)
end``````

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