Add raindrops exercise (#242)

config.json

@@ -176,6 +176,14 @@
           "math"
         ]
       },
+      {
+        "slug": "raindrops",
+        "name": "Raindrops",
+        "uuid": "7a07c4ae-608f-48d6-8641-c7ceba849dd6",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 2
+      },
       {
         "slug": "resistor-color",
         "name": "Resistor Color",

exercises/practice/raindrops/.docs/instructions.md

@@ -0,0 +1,20 @@
+# Instructions
+
+Your task is to convert a number into a string that contains raindrop sounds corresponding to certain potential factors.
+A factor is a number that evenly divides into another number, leaving no remainder.
+The simplest way to test if one number is a factor of another is to use the [modulo operation][modulo].
+
+The rules of `raindrops` are that if a given number:
+
+- has 3 as a factor, add 'Pling' to the result.
+- has 5 as a factor, add 'Plang' to the result.
+- has 7 as a factor, add 'Plong' to the result.
+- _does not_ have any of 3, 5, or 7 as a factor, the result should be the digits of the number.
+
+## Examples
+
+- 28 has 7 as a factor, but not 3 or 5, so the result would be "Plong".
+- 30 has both 3 and 5 as factors, but not 7, so the result would be "PlingPlang".
+- 34 is not factored by 3, 5, or 7, so the result would be "34".
+
+[modulo]: https://en.wikipedia.org/wiki/Modulo_operation

exercises/practice/raindrops/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "BNAndras"
+  ],
+  "files": {
+    "solution": [
+      "raindrops.coffee"
+    ],
+    "test": [
+      "raindrops.spec.coffee"
+    ],
+    "example": [
+      ".meta/example.coffee"
+    ]
+  },
+  "blurb": "Convert a number to a string, the content of which depends on the number's factors.",
+  "source": "A variation on FizzBuzz, a famous technical interview question that is intended to weed out potential candidates. That question is itself derived from Fizz Buzz, a popular children's game for teaching division.",
+  "source_url": "https://en.wikipedia.org/wiki/Fizz_buzz"
+}

exercises/practice/raindrops/.meta/example.coffee

@@ -0,0 +1,13 @@
+class Raindrops
+  @convert: (number) ->
+    results = ''
+    if number % 3 == 0
+      results += 'Pling'
+    if number % 5 == 0
+      results += 'Plang'
+    if number % 7 == 0
+      results += 'Plong'
+
+    if !!results then results else number.toString()
+
+module.exports = Raindrops

exercises/practice/raindrops/.meta/tests.toml

@@ -0,0 +1,64 @@
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
+
+[1575d549-e502-46d4-a8e1-6b7bec6123d8]
+description = "the sound for 1 is 1"
+
+[1f51a9f9-4895-4539-b182-d7b0a5ab2913]
+description = "the sound for 3 is Pling"
+
+[2d9bfae5-2b21-4bcd-9629-c8c0e388f3e0]
+description = "the sound for 5 is Plang"
+
+[d7e60daa-32ef-4c23-b688-2abff46c4806]
+description = "the sound for 7 is Plong"
+
+[6bb4947b-a724-430c-923f-f0dc3d62e56a]
+description = "the sound for 6 is Pling as it has a factor 3"
+
+[ce51e0e8-d9d4-446d-9949-96eac4458c2d]
+description = "2 to the power 3 does not make a raindrop sound as 3 is the exponent not the base"
+
+[0dd66175-e3e2-47fc-8750-d01739856671]
+description = "the sound for 9 is Pling as it has a factor 3"
+
+[022c44d3-2182-4471-95d7-c575af225c96]
+description = "the sound for 10 is Plang as it has a factor 5"
+
+[37ab74db-fed3-40ff-b7b9-04acdfea8edf]
+description = "the sound for 14 is Plong as it has a factor of 7"
+
+[31f92999-6afb-40ee-9aa4-6d15e3334d0f]
+description = "the sound for 15 is PlingPlang as it has factors 3 and 5"
+
+[ff9bb95d-6361-4602-be2c-653fe5239b54]
+description = "the sound for 21 is PlingPlong as it has factors 3 and 7"
+
+[d2e75317-b72e-40ab-8a64-6734a21dece1]
+description = "the sound for 25 is Plang as it has a factor 5"
+
+[a09c4c58-c662-4e32-97fe-f1501ef7125c]
+description = "the sound for 27 is Pling as it has a factor 3"
+
+[bdf061de-8564-4899-a843-14b48b722789]
+description = "the sound for 35 is PlangPlong as it has factors 5 and 7"
+
+[c4680bee-69ba-439d-99b5-70c5fd1a7a83]
+description = "the sound for 49 is Plong as it has a factor 7"
+
+[17f2bc9a-b65a-4d23-8ccd-266e8c271444]
+description = "the sound for 52 is 52"
+
+[e46677ed-ff1a-419f-a740-5c713d2830e4]
+description = "the sound for 105 is PlingPlangPlong as it has factors 3, 5 and 7"
+
+[13c6837a-0fcd-4b86-a0eb-20572f7deb0b]
+description = "the sound for 3125 is Plang as it has a factor 5"

exercises/practice/raindrops/raindrops.coffee

@@ -0,0 +1,4 @@
+class Raindrops
+  @convert: (number) ->
+
+module.exports = Raindrops

exercises/practice/raindrops/raindrops.spec.coffee

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+
+Raindrops = require './raindrops'
+
+describe 'Raindrops', ->
+  it 'the sound for 1 is 1', ->
+    number = 1
+    results = Raindrops.convert(number)
+    expected = '1'
+    expect(results).toEqual expected
+
+  xit 'the sound for 3 is Pling', ->
+    number = 3
+    results = Raindrops.convert(number)
+    expected = 'Pling'
+    expect(results).toEqual expected
+
+  xit 'the sound for 5 is Plang', ->
+    number = 5
+    results = Raindrops.convert(number)
+    expected = 'Plang'
+    expect(results).toEqual expected
+
+  xit 'the sound for 7 is Plong', ->
+    number = 7
+    results = Raindrops.convert(number)
+    expected = 'Plong'
+    expect(results).toEqual expected
+
+  xit 'the sound for 6 is Pling as it has a factor 3', ->
+    number = 6
+    results = Raindrops.convert(number)
+    expected = 'Pling'
+    expect(results).toEqual expected
+
+  xit '2 to the power 3 does not make a raindrop sound as 3 is the exponent not the base', ->
+    number = 8
+    results = Raindrops.convert(number)
+    expected = '8'
+    expect(results).toEqual expected
+
+  xit 'the sound for 9 is Pling as it has a factor 3', ->
+    number = 9
+    results = Raindrops.convert(number)
+    expected = 'Pling'
+    expect(results).toEqual expected
+
+  xit 'the sound for 10 is Plang as it has a factor 5', ->
+    number = 10
+    results = Raindrops.convert(number)
+    expected = 'Plang'
+    expect(results).toEqual expected
+
+  xit 'the sound for 14 is Plong as it has a factor of 7', ->
+    number = 14
+    results = Raindrops.convert(number)
+    expected = 'Plong'
+    expect(results).toEqual expected
+
+  xit 'the sound for 15 is PlingPlang as it has factors 3 and 5', ->
+    number = 15
+    results = Raindrops.convert(number)
+    expected = 'PlingPlang'
+    expect(results).toEqual expected
+
+  xit 'the sound for 21 is PlingPlong as it has factors 3 and 7', ->
+    number = 21
+    results = Raindrops.convert(number)
+    expected = 'PlingPlong'
+    expect(results).toEqual expected
+
+  xit 'the sound for 25 is Plang as it has a factor 5', ->
+    number = 25
+    results = Raindrops.convert(number)
+    expected = 'Plang'
+    expect(results).toEqual expected
+
+  xit 'the sound for 27 is Pling as it has a factor 3', ->
+    number = 27
+    results = Raindrops.convert(number)
+    expected = 'Pling'
+    expect(results).toEqual expected
+
+  xit 'the sound for 35 is PlangPlong as it has factors 5 and 7', ->
+    number = 35
+    results = Raindrops.convert(number)
+    expected = 'PlangPlong'
+    expect(results).toEqual expected
+
+  xit 'the sound for 49 is Plong as it has a factor 7', ->
+    number = 49
+    results = Raindrops.convert(number)
+    expected = 'Plong'
+    expect(results).toEqual expected
+
+  xit 'the sound for 52 is 52', ->
+    number = 52
+    results = Raindrops.convert(number)
+    expected = '52'
+    expect(results).toEqual expected
+
+  xit 'the sound for 105 is PlingPlangPlong as it has factors 3, 5 and 7', ->
+    number = 105
+    results = Raindrops.convert(number)
+    expected = 'PlingPlangPlong'
+    expect(results).toEqual expected
+
+  xit 'the sound for 3125 is Plang as it has a factor 5', ->
+    number = 3125
+    results = Raindrops.convert(number)
+    expected = 'Plang'
+    expect(results).toEqual expected