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exklamationmark's solution

to Scrabble Score in the Go Track

Published at Jul 31 2018 · 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 the tests

To run the tests run the command go test from within the exercise directory.

If the test suite contains benchmarks, you can run these with the --bench and --benchmem flags:

go test -v --bench . --benchmem

Keep in mind that each reviewer will run benchmarks on a different machine, with different specs, so the results from these benchmark tests may vary.

Further information

For more detailed information about the Go track, including how to get help if you're having trouble, please visit the exercism.io Go language page.

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.

cases_test.go

package scrabble

// Source: exercism/problem-specifications
// Commit: 0d882ed scrabble-score: Apply new "input" policy
// Problem Specifications Version: 1.1.0

type scrabbleTest struct {
	input    string
	expected int
}

var scrabbleScoreTests = []scrabbleTest{
	{"a", 1},                // lowercase letter
	{"A", 1},                // uppercase letter
	{"f", 4},                // valuable letter
	{"at", 2},               // short word
	{"zoo", 12},             // short, valuable word
	{"street", 6},           // medium word
	{"quirky", 22},          // medium, valuable word
	{"OxyphenButazone", 41}, // long, mixed-case word
	{"pinata", 8},           // english-like word
	{"", 0},                 // empty input
	{"abcdefghijklmnopqrstuvwxyz", 87}, // entire alphabet available
}

scrabble_score_test.go

package scrabble

import "testing"

func TestScore(t *testing.T) {
	for _, test := range scrabbleScoreTests {
		if actual := Score(test.input); actual != test.expected {
			t.Errorf("Score(%q) expected %d, Actual %d", test.input, test.expected, actual)
		}
	}
}

func BenchmarkScore(b *testing.B) {
	for i := 0; i < b.N; i++ {
		for _, test := range scrabbleScoreTests {
			Score(test.input)
		}
	}
}
package scrabble

import "strings"

var (
	runeScore = map[rune]int{
		'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,
	}
)

// Score calculates the scrabble score of an ASCII word
// by summing the score characters in it.
// 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
func Score(str string) int {
	score := 0
	for _, r := range strings.ToUpper(str) {
		score += runeScore[r]
	}

	return score
}

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