48 lines
1.5 KiB
Markdown
48 lines
1.5 KiB
Markdown
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# Resistor Color Duo
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Welcome to Resistor Color Duo on Exercism's Elixir Track.
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If you need help running the tests or submitting your code, check out `HELP.md`.
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## Instructions
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If you want to build something using a Raspberry Pi, you'll probably use _resistors_.
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For this exercise, you need to know two things about them:
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- Each resistor has a resistance value.
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- Resistors are small - so small in fact that if you printed the resistance value on them, it would be hard to read.
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To get around this problem, manufacturers print color-coded bands onto the resistors to denote their resistance values.
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Each band has a position and a numeric value.
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The first 2 bands of a resistor have a simple encoding scheme: each color maps to a single number.
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For example, if they printed a brown band (value 1) followed by a green band (value 5), it would translate to the number 15.
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In this exercise you are going to create a helpful program so that you don't have to remember the values of the bands.
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The program will take color names as input and output a two digit number, even if the input is more than two colors!
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The band colors are encoded as follows:
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- Black: 0
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- Brown: 1
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- Red: 2
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- Orange: 3
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- Yellow: 4
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- Green: 5
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- Blue: 6
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- Violet: 7
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- Grey: 8
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- White: 9
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From the example above:
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brown-green should return 15
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brown-green-violet should return 15 too, ignoring the third color.
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## Source
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### Created by
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- @jiegillet
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### Based on
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Maud de Vries, Erik Schierboom - https://github.com/exercism/problem-specifications/issues/1464
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