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Add all three resistor exercises (#9)
* All three resistor exercises * Difficulties
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‎config.json‎

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"practices": [],
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"prerequisites": [],
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"difficulty": 1
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},
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{
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"slug": "resistor-color-duo",
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"name": "Resistor Color Duo",
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"uuid": "e4c59681-3664-4ad4-8948-83b6084ad244",
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"practices": [],
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"prerequisites": [],
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"difficulty": 1
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},
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{
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"slug": "resistor-color",
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"name": "Resistor Color",
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"uuid": "366f8b1c-2368-4e96-9dff-21b552a3be14",
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"practices": [],
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"prerequisites": [],
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"difficulty": 1
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},
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{
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"slug": "resistor-color-trio",
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"name": "Resistor Color Trio",
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"uuid": "a1f5a88f-aa72-405f-88a3-e1a120ce3a89",
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"practices": [],
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"prerequisites": [],
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"difficulty": 1
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}
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]
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},

‎exercises/practice/resistor-color-duo/.docs/instructions.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, and
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brown-green-violet should return 15 too, ignoring the third color.

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

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{
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"authors": [
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"quintuple-mallard"
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],
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"files": {
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"solution": [
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"resistor-color-duo.nu"
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],
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"test": [
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"tests.nu"
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],
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"example": [
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".meta/example.nu"
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]
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},
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"blurb": "Convert color codes, as used on resistors, to a numeric value.",
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"source": "Maud de Vries, Erik Schierboom",
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"source_url": "https://github.com/exercism/problem-specifications/issues/1464",
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"difficulty": 2
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}

‎exercises/practice/resistor-color-duo/.meta/example.nu‎

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def color_code [color] {
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[black brown red orange yellow green blue violet grey white]
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| enumerate
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| filter {|item| $item.item == $color}
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| get index
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| get 0
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}
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export def value [colors] {
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(color_code $colors.0) * 10 + (color_code $colors.1)
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}

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

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# This is an auto-generated file.
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#
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# Regenerating this file via `configlet sync` will:
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# - Recreate every `description` key/value pair
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# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
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# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
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# - Preserve any other key/value pair
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#
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# As user-added comments (using the # character) will be removed when this file
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# is regenerated, comments can be added via a `comment` key.
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[ce11995a-5b93-4950-a5e9-93423693b2fc]
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description = "Brown and black"
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[7bf82f7a-af23-48ba-a97d-38d59406a920]
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description = "Blue and grey"
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[f1886361-fdfd-4693-acf8-46726fe24e0c]
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description = "Yellow and violet"
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[b7a6cbd2-ae3c-470a-93eb-56670b305640]
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description = "White and red"
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[77a8293d-2a83-4016-b1af-991acc12b9fe]
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description = "Orange and orange"
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[0c4fb44f-db7c-4d03-afa8-054350f156a8]
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description = "Ignore additional colors"
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[4a8ceec5-0ab4-4904-88a4-daf953a5e818]
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description = "Black and brown, one-digit"

‎exercises/practice/resistor-color-duo/resistor-color-duo.nu‎

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export def value [colors] {
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error make {"msg": "Remove this line and implement value"}
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}

‎exercises/practice/resistor-color-duo/tests.nu‎

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use resistor-color-duo.nu value
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use std/assert
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assert equal (value [brown black]) 10
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assert equal (value [blue grey]) 68
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assert equal (value [yellow violet]) 47
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assert equal (value [orange orange]) 33
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assert equal (value [green brown orange]) 51
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assert equal (value [black brown]) 1

‎exercises/practice/resistor-color-trio/.docs/instructions.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 only three 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 acts as a digit of a 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 3 colors as input, and outputs the correct value, in ohms.
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The color bands 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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In Resistor Color Duo you decoded the first two colors.
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For instance: orange-orange got the main value `33`.
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The third color stands for how many zeros need to be added to the main value.
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The main value plus the zeros gives us a value in ohms.
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For the exercise it doesn't matter what ohms really are.
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For example:
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- orange-orange-black would be 33 and no zeros, which becomes 33 ohms.
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- orange-orange-red would be 33 and 2 zeros, which becomes 3300 ohms.
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- orange-orange-orange would be 33 and 3 zeros, which becomes 33000 ohms.
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(If Math is your thing, you may want to think of the zeros as exponents of 10.
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If Math is not your thing, go with the zeros.
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It really is the same thing, just in plain English instead of Math lingo.)
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This exercise is about translating the colors into a label:
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> "... ohms"
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So an input of `"orange", "orange", "black"` should return:
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> "33 ohms"
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When we get to larger resistors, a [metric prefix][metric-prefix] is used to indicate a larger magnitude of ohms, such as "kiloohms".
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That is similar to saying "2 kilometers" instead of "2000 meters", or "2 kilograms" for "2000 grams".
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For example, an input of `"orange", "orange", "orange"` should return:
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> "33 kiloohms"
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[metric-prefix]: https://en.wikipedia.org/wiki/Metric_prefix

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

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{
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"authors": [
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"quintuple-mallard"
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],
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"files": {
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"solution": [
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"resistor-color-trio.nu"
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],
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"test": [
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"tests.nu"
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],
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"example": [
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".meta/example.nu"
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]
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},
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"blurb": "Convert color codes, as used on resistors, to a human-readable label.",
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"source": "Maud de Vries, Erik Schierboom",
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"source_url": "https://github.com/exercism/problem-specifications/issues/1549",
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"difficulty": 4
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}

‎exercises/practice/resistor-color-trio/.meta/example.nu‎

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def color_code [color] {
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[black brown red orange yellow green blue violet grey white]
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| enumerate
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| filter {|item| $item.item == $color}
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| get index
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| get 0
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}
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def value [colors] {
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(color_code $colors.0) * 10 + (color_code $colors.1)
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}
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def unit [] {
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let ohms = $in
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if $ohms < 1_000 {
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$"($ohms) ohms"
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} else if $ohms < 1_000_000 {
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$"($ohms / 1_000) kiloohms"
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} else if $ohms < 1_000_000_000 {
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$"($ohms / 1_000_000) megaohms"
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} else {
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$"($ohms / 1_000_000_000) gigaohms"
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}
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}
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export def label [colors] {
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(value $colors) * 10 ** ((color_code $colors.2)) | unit
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}

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