diff --git a/config.json b/config.json index 8689ac6..29cd694 100644 --- a/config.json +++ b/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", diff --git a/exercises/practice/resistor-color/.docs/instructions.md b/exercises/practice/resistor-color/.docs/instructions.md new file mode 100644 index 0000000..646c143 --- /dev/null +++ b/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 diff --git a/exercises/practice/resistor-color/.meta/config.json b/exercises/practice/resistor-color/.meta/config.json new file mode 100644 index 0000000..1901d3a --- /dev/null +++ b/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" +} diff --git a/exercises/practice/resistor-color/.meta/example.coffee b/exercises/practice/resistor-color/.meta/example.coffee new file mode 100644 index 0000000..70b9f7d --- /dev/null +++ b/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 diff --git a/exercises/practice/resistor-color/.meta/tests.toml b/exercises/practice/resistor-color/.meta/tests.toml new file mode 100644 index 0000000..9d4ee97 --- /dev/null +++ b/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" diff --git a/exercises/practice/resistor-color/resistor-color.coffee b/exercises/practice/resistor-color/resistor-color.coffee new file mode 100644 index 0000000..5f7fead --- /dev/null +++ b/exercises/practice/resistor-color/resistor-color.coffee @@ -0,0 +1,6 @@ +class ResistorColor + @colorCode: (color) -> + + @colors: () -> + +module.exports = ResistorColor diff --git a/exercises/practice/resistor-color/resistor-color.spec.coffee b/exercises/practice/resistor-color/resistor-color.spec.coffee new file mode 100644 index 0000000..cdd17cf --- /dev/null +++ b/exercises/practice/resistor-color/resistor-color.spec.coffee @@ -0,0 +1,33 @@ +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