Add bash/raindrops

bash/raindrops/README.md

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+# Raindrops
+
+Convert a number to a string, the contents of which depend on the number's factors.
+
+- If the number has 3 as a factor, output 'Pling'.
+- If the number has 5 as a factor, output 'Plang'.
+- If the number has 7 as a factor, output 'Plong'.
+- If the number does not have 3, 5, or 7 as a factor,
+  just pass the number's digits straight through.
+
+## Examples
+
+- 28's factors are 1, 2, 4, **7**, 14, 28.
+  - In raindrop-speak, this would be a simple "Plong".
+- 30's factors are 1, 2, **3**, **5**, 6, 10, 15, 30.
+  - In raindrop-speak, this would be a "PlingPlang".
+- 34 has four factors: 1, 2, 17, and 34.
+  - In raindrop-speak, this would be "34".
+
+
+Run the tests with:
+
+```bash
+bats raindrops_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 raindrops_test.sh
+```
+
+## Source
+
+A variation on a famous interview question intended to weed out potential candidates. [http://jumpstartlab.com](http://jumpstartlab.com)
+
+
+## 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/raindrops/raindrops.sh

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+#!/usr/bin/env bash
+
+main() {
+  local name=""
+
+  if [ $(($1 % 3)) -eq 0 ]; then
+    name="Pling"
+  fi
+
+  if [ $(($1 % 5)) -eq 0 ]; then
+    name="${name}Plang"
+  fi
+
+  if [ $(($1 % 7)) -eq 0 ]; then
+    name="${name}Plong"
+  fi
+
+  if [ "$name" = "" ]; then
+    name="$1"
+  fi
+
+  echo $name
+}
+
+main "$@"

bash/raindrops/raindrops_test.sh

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+#!/usr/bin/env bash
+
+@test "the sound for 1 is 1" {
+  run bash raindrops.sh 1
+  [ "$status" -eq 0 ]
+  [ "$output" == "1" ]
+}
+
+@test "the sound for 3 is Pling" {
+  run bash raindrops.sh 3
+  [ "$status" -eq 0 ]
+  [ "$output" == "Pling" ]
+}
+
+@test "the sound for 5 is Plang" {
+  run bash raindrops.sh 5
+  [ "$status" -eq 0 ]
+  [ "$output" == "Plang" ]
+}
+
+@test "the sound for 7 is Plong" {
+  run bash raindrops.sh 7
+  [ "$status" -eq 0 ]
+  [ "$output" == "Plong" ]
+}
+
+@test "the sound for 6 is Pling as it has a factor 3" {
+  run bash raindrops.sh 6
+  [ "$status" -eq 0 ]
+  [ "$output" == "Pling" ]
+}
+
+@test "2 to the power 3 does not make a raindrop sound as 3 is the exponent not the base" {
+  run bash raindrops.sh 8
+  [ "$status" -eq 0 ]
+  [ "$output" == "8" ]
+}
+
+@test "the sound for 9 is Pling as it has a factor 3" {
+  run bash raindrops.sh 9
+  [ "$status" -eq 0 ]
+  [ "$output" == "Pling" ]
+}
+
+@test "the sound for 10 is Plang as it has a factor 5" {
+  run bash raindrops.sh 10
+  [ "$status" -eq 0 ]
+  [ "$output" == "Plang" ]
+}
+
+@test "the sound for 14 is Plong as it has a factor of 7" {
+  run bash raindrops.sh 14
+  [ "$status" -eq 0 ]
+  [ "$output" == "Plong" ]
+}
+
+@test "the sound for 15 is PlingPlang as it has factors 3 and 5" {
+  run bash raindrops.sh 15
+  [ "$status" -eq 0 ]
+  [ "$output" == "PlingPlang" ]
+}
+
+@test "the sound for 21 is PlingPlong as it has factors 3 and 7" {
+  run bash raindrops.sh 21
+  [ "$status" -eq 0 ]
+  [ "$output" == "PlingPlong" ]
+}
+
+@test "the sound for 25 is Plang as it has a factor 5" {
+  run bash raindrops.sh 25
+  [ "$status" -eq 0 ]
+  [ "$output" == "Plang" ]
+}
+
+@test "the sound for 27 is Pling as it has a factor 3" {
+  run bash raindrops.sh 27
+  [ "$status" -eq 0 ]
+  [ "$output" == "Pling" ]
+}
+
+@test "the sound for 35 is PlangPlong as it has factors 5 and 7" {
+  run bash raindrops.sh 35
+  [ "$status" -eq 0 ]
+  [ "$output" == "PlangPlong" ]
+}
+
+@test "the sound for 49 is Plong as it has a factor 7" {
+  run bash raindrops.sh 49
+  [ "$status" -eq 0 ]
+  [ "$output" == "Plong" ]
+}
+
+@test "the sound for 52 is 52" {
+  run bash raindrops.sh 52
+  [ "$status" -eq 0 ]
+  [ "$output" == "52" ]
+}
+
+@test "the sound for 105 is PlingPlangPlong as it has factors 3, 5 and 7" {
+  run bash raindrops.sh 105
+  [ "$status" -eq 0 ]
+  [ "$output" == "PlingPlangPlong" ]
+}
+
+@test "the sound for 3125 is Plang as it has a factor 5" {
+  run bash raindrops.sh 3125
+  [ "$status" -eq 0 ]
+  [ "$output" == "Plang" ]
+}