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bash/scrabble-score/README.md

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+# Scrabble Score
+
+Given a word, compute the scrabble score for that word.
+
+## Letter Values
+
+You'll need these:
+
+```text
+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:
+
+```bash
+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:
+
+```bash
+BATS_RUN_SKIPPED=true bats scrabble_score_test.sh
+```
+
+## Source
+
+Inspired by the Extreme Startup game [https://github.com/rchatley/extreme_startup](https://github.com/rchatley/extreme_startup)
+
+
+## External utilities
+`Bash` is a language to write "scripts" -- programs that can call
+external tools, such as
+[`sed`](https://www.gnu.org/software/sed/),
+[`awk`](https://www.gnu.org/software/gawk/),
+[`date`](https://www.gnu.org/software/coreutils/manual/html_node/date-invocation.html)
+and even programs written in other programming languages, 
+like [`Python`](https://www.python.org/).
+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.

bash/scrabble-score/scrabble_score.sh

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+#!/usr/bin/env bash
+#
+# V1: initial version
+# V2: check for alphabetic chars only
+
+shopt -s extglob
+
+# set to mask to enable logs. 0: none, 255: all
+(( debug=2#00000000 ))
+#(( debug=2#00001111 ))
+# $1: log level (mask), then strings to display.
+debug () {
+    (( debug & $1 )) && shift && echo Line ${BASH_LINENO[0]}: "${@}" >&2
+}
+
+die () {
+    echo "${@}" >&2
+    exit 1
+}
+usage() {
+    die "usage: scrabble_score.sh word"
+}
+
+declare -A values=(
+    [A]=1 [E]=1 [I]=1 [O]=1 [U]=1 [L]=1 [N]=1 [R]=1 [S]=1 [T]=1
+    [D]=2 [G]=2
+    [B]=3 [C]=3 [M]=3 [P]=3
+    [F]=4 [H]=4 [V]=4 [W]=4 [Y]=4
+    [K]=5
+    [J]=8 [X]=8
+    [Q]=10 [Z]=10
+)
+
+(($# != 1)) && usage
+word="${1^^}"                                     # capitalize
+[[ "$word" != +([[:upper:]]) ]] && usage          # accept only alpha chars
+
+debug 1 arg="$word"
+((score=0))
+
+for (( i=0; i<${#word}; ++i )); do
+    c="${word:$i:1}"
+    ((score += ${values[$c]}))
+done
+
+echo "$score"
+exit 0
+
+# emacs/vim settings.
+# Local Variables:
+# sh-basic-offset: 4
+# indent-tabs-mode: nil
+# comment-column: 50
+# fill-column: 80
+# End:
+# vim: set tabstop=4 expandtab: