KirovVerst's solution to Scrabble Score on the Bash track

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.

Run the tests with:

bats scrabble_score_test.sh

After the first test(s) pass, continue by commenting out or removing the [[ $BATS_RUN_SKIPPED == true ]] || skip annotations prepending other tests.

To run all tests, including the ones with skip annotations, run:

BATS_RUN_SKIPPED=true bats scrabble_score_test.sh

Source

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

External utilities

Bash is a language to write "scripts" -- programs that can call external tools, such as sed, awk, date and even programs written in other programming languages, like Python. This track does not restrict the usage of these utilities, and as long as your solution is portable between systems and does not require installation of third party applications, feel free to use them to solve the exercise.

For an extra challenge, if you would like to have a better understanding of the language, try to re-implement the solution in pure Bash, without using any external tools. Note that there are some types of problems that bash cannot solve, such as performing floating point arithmetic and manipulating dates: for those, you must call out to an external tool.

Submitting Incomplete Solutions

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

scrabble_score_test.sh

#!/usr/bin/env bash

# local version: 1.1.0.0

@test 'lowercase letter' {
  #[[ $BATS_RUN_SKIPPED == true  ]] || skip
  run bash scrabble_score.sh 'a'
  
  [[ $status -eq 0 ]]
  [[ $output == "1" ]]
}

@test 'uppercase letter' {
  [[ $BATS_RUN_SKIPPED == true  ]] || skip
  run bash scrabble_score.sh 'A'
  
  [[ $status -eq 0 ]]
  [[ $output == "1" ]]
}

@test 'valuable letter' {
  [[ $BATS_RUN_SKIPPED == true  ]] || skip
  run bash scrabble_score.sh 'f'
  
  [[ $status -eq 0 ]]
  [[ $output == "4" ]]
}

@test 'short word' {
  [[ $BATS_RUN_SKIPPED == true  ]] || skip
  run bash scrabble_score.sh 'at'
  
  [[ $status -eq 0 ]]
  [[ $output == "2" ]]
}

@test 'short, valuable word' {
  [[ $BATS_RUN_SKIPPED == true  ]] || skip
  run bash scrabble_score.sh 'zoo'
  
  [[ $status -eq 0 ]]
  [[ $output == "12" ]]
}

@test 'medium word' {
  [[ $BATS_RUN_SKIPPED == true  ]] || skip
  run bash scrabble_score.sh 'street'
  
  [[ $status -eq 0 ]]
  [[ $output == "6" ]]
}

@test 'medium, valuable word' {
  [[ $BATS_RUN_SKIPPED == true  ]] || skip
  run bash scrabble_score.sh 'quirky'
  
  [[ $status -eq 0 ]]
  [[ $output == "22" ]]
}

@test 'long, mixed-case word' {
  [[ $BATS_RUN_SKIPPED == true  ]] || skip
  run bash scrabble_score.sh 'OxyphenButazone'
  
  [[ $status -eq 0 ]]
  [[ $output == "41" ]]
}

@test 'english-like word' {
  [[ $BATS_RUN_SKIPPED == true  ]] || skip
  run bash scrabble_score.sh 'pinata'
  
  [[ $status -eq 0 ]]
  [[ $output == "8" ]]
}

@test 'empty input' {
  [[ $BATS_RUN_SKIPPED == true  ]] || skip
  run bash scrabble_score.sh ''
  
  [[ $status -eq 0 ]]
  [[ $output == "0" ]]
}

@test 'entire alphabet available' {
  [[ $BATS_RUN_SKIPPED == true  ]] || skip
  run bash scrabble_score.sh 'abcdefghijklmnopqrstuvwxyz'
  
  [[ $status -eq 0 ]]
  [[ $output == "87" ]]
}

#!/usr/bin/env bash

# The following comments should help you get started:
# - Bash is flexible. You may use functions or write a "raw" script.
#
# - Complex code can be made easier to read by breaking it up
#   into functions, however this is sometimes overkill in bash.
#
# - You can find links about good style and other resources
#   for Bash in './README.md'. It came with this exercise.
#
#   Example:
#   # other functions here
#   # ...
#   # ...
#
main () {
    s="$(echo $1 | tr [:lower:] [:upper:])"
    result=0
    for (( i=0; i<${#s}; i++ )); do
        if [[ ${s:i:1} =~ [AEIOULNRST] ]]; then
            result=$((result+1))
        fi

        if [[ ${s:i:1} =~ [DG] ]]; then
            result=$((result+2))
        fi

        if [[ ${s:i:1} =~ [BCMP] ]]; then
            result=$((result+3))
        fi

        if [[ ${s:i:1} =~ [FHVWY] ]]; then
            result=$((result+4))
        fi

        if [[ ${s:i:1} =~ [K] ]]; then
            result=$((result+5))
        fi
        
        if [[ ${s:i:1} =~ [JX] ]]; then
            result=$((result+8))
        fi

        if [[ ${s:i:1} =~ [QZ] ]]; then
            result=$((result+10))
        fi
    done
    echo $result
}
#
#   # call main with all of the positional arguments
  main "$@"
#
# *** PLEASE REMOVE THESE COMMENTS BEFORE SUBMITTING YOUR SOLUTION ***

What can you learn from this solution?

A huge amount can be learned from reading other people’s code. This is why we wanted to give exercism users the option of making their solutions public.

Here are some questions to help you reflect on this solution and learn the most from it.

What compromises have been made?
Are there new concepts here that you could read more about to improve your understanding?

KirovVerst's solution

to Scrabble Score in the Bash Track