Add resistor-color exercise

config.json

@@ -153,6 +153,14 @@
           "math"
         ]
       },
+      {
+        "slug": "resistor-color",
+        "name": "Resistor Color",
+        "uuid": "6f128832-f1b8-4a35-85b1-61c4d487afde",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 2
+      },
       {
         "slug": "rna-transcription",
         "name": "Rna Transcription",

exercises/practice/resistor-color/.docs/instructions.md

@@ -0,0 +1,39 @@
+# Instructions
+
+If you want to build something using a Raspberry Pi, you'll probably use _resistors_.
+For this exercise, you need to know two things about them:
+
+- Each resistor has a resistance value.
+- Resistors are small - so small in fact that if you printed the resistance value on them, it would be hard to read.
+
+To get around this problem, manufacturers print color-coded bands onto the resistors to denote their resistance values.
+Each band has a position and a numeric value.
+
+The first 2 bands of a resistor have a simple encoding scheme: each color maps to a single number.
+
+In this exercise you are going to create a helpful program so that you don't have to remember the values of the bands.
+
+These colors are encoded as follows:
+
+- Black: 0
+- Brown: 1
+- Red: 2
+- Orange: 3
+- Yellow: 4
+- Green: 5
+- Blue: 6
+- Violet: 7
+- Grey: 8
+- White: 9
+
+The goal of this exercise is to create a way:
+
+- to look up the numerical value associated with a particular color band
+- to list the different band colors
+
+Mnemonics map the colors to the numbers, that, when stored as an array, happen to map to their index in the array:
+Better Be Right Or Your Great Big Values Go Wrong.
+
+More information on the color encoding of resistors can be found in the [Electronic color code Wikipedia article][e-color-code].
+
+[e-color-code]: https://en.wikipedia.org/wiki/Electronic_color_code

exercises/practice/resistor-color/.meta/config.json

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "BNAndras"
+  ],
+  "files": {
+    "solution": [
+      "resistor-color.coffee"
+    ],
+    "test": [
+      "resistor-color.spec.coffee"
+    ],
+    "example": [
+      ".meta/example.coffee"
+    ]
+  },
+  "blurb": "Convert a resistor band's color to its numeric representation.",
+  "source": "Maud de Vries, Erik Schierboom",
+  "source_url": "https://github.com/exercism/problem-specifications/issues/1458"
+}

exercises/practice/resistor-color/.meta/example.coffee

@@ -0,0 +1,21 @@
+class ResistorColor
+  @colorBands: [
+        "black"
+        "brown"
+        "red"
+        "orange"
+        "yellow"
+        "green"
+        "blue"
+        "violet"
+        "grey"
+        "white"
+    ]
+
+  @colorCode: (color) ->
+    @colorBands.indexOf(color)
+
+  @colors: () ->
+    @colorBands
+
+module.exports = ResistorColor

exercises/practice/resistor-color/.meta/tests.toml

@@ -0,0 +1,22 @@
+# 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.
+
+[49eb31c5-10a8-4180-9f7f-fea632ab87ef]
+description = "Color codes -> Black"
+
+[0a4df94b-92da-4579-a907-65040ce0b3fc]
+description = "Color codes -> White"
+
+[5f81608d-f36f-4190-8084-f45116b6f380]
+description = "Color codes -> Orange"
+
+[581d68fa-f968-4be2-9f9d-880f2fb73cf7]
+description = "Colors"

exercises/practice/resistor-color/resistor-color.coffee

@@ -0,0 +1,6 @@
+class ResistorColor
+  @colorCode: (color) ->
+
+  @colors: () ->
+
+module.exports = ResistorColor

exercises/practice/resistor-color/resistor-color.spec.coffee

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+ResistorColor = require './resistor-color'
+
+describe 'ResistorColor', ->
+  it 'Black', ->
+    results = ResistorColor.colorCode('black')
+    expected = 0
+    expect(results).toEqual expected
+
+  xit 'White', ->
+    results = ResistorColor.colorCode('white')
+    expected = 9
+    expect(results).toEqual expected
+
+  xit 'Orange', ->
+    results = ResistorColor.colorCode('orange')
+    expected = 3
+    expect(results).toEqual expected
+
+  xit 'Colors', ->
+    results = ResistorColor.colors()
+    expected = [
+        'black'
+        'brown'
+        'red'
+        'orange'
+        'yellow'
+        'green'
+        'blue'
+        'violet'
+        'grey'
+        'white'
+    ]
+    expect(results).toEqual expected