Zig: completed Resistor Color

zig/resistor-color/.exercism/config.json

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+{
+  "authors": [
+    "massivelivefun"
+  ],
+  "files": {
+    "solution": [
+      "resistor_color.zig"
+    ],
+    "test": [
+      "test_resistor_color.zig"
+    ],
+    "example": [
+      ".meta/example.zig"
+    ]
+  },
+  "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"
+}

zig/resistor-color/.exercism/metadata.json

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+{"track":"zig","exercise":"resistor-color","id":"a44178efdd0949b4936b7309fe486b87","url":"https://exercism.org/tracks/zig/exercises/resistor-color","handle":"Chomp1295","is_requester":true,"auto_approve":false}

zig/resistor-color/HELP.md

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+# Help
+
+## Running the tests
+
+Write your code in `<exercise_name>.zig`.
+
+To run the tests for an exercise, run:
+
+```bash
+zig test test_exercise_name.zig
+```
+
+in the exercise's root directory (replacing `exercise_name` with the name of the exercise).
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit resistor_color.zig` command.
+This command will upload your solution to the Exercism website and print the solution page's URL.
+
+It's possible to submit an incomplete solution which allows you to:
+
+- See how others have completed the exercise
+- Request help from a mentor
+
+## Need to get help?
+
+If you'd like help solving the exercise, check the following pages:
+
+- The [Zig track's documentation](https://exercism.org/docs/tracks/zig)
+- The [Zig track's programming category on the forum](https://forum.exercism.org/c/programming/zig)
+- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
+- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
+
+Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
+
+- [The Zig Programming Language Documentation][documentation] is a great overview of all of the language features that Zig provides to those who use it.
+- [Zig Guide][zig-guide] is an excellent primer that explains the language features that Zig has to offer.
+- [Ziglings][ziglings] is highly recommended.
+  Learn Zig by fixing tiny broken programs.
+- [The Zig Programming Language Discord][discord-zig] is the main [Discord][discord].
+  It provides a great way to get in touch with the Zig community at large, and get some quick, direct help for any Zig related problem.
+- [#zig][irc] on irc.freenode.net is the main Zig IRC channel.
+- [/r/Zig][reddit] is the main Zig subreddit.
+- [Stack Overflow][stack-overflow] can be used to discover code snippets and solutions to problems that may have already asked and maybe solved by others.
+
+[discord]: https://discordapp.com
+[discord-zig]: https://discord.com/invite/gxsFFjE
+[documentation]: https://ziglang.org/documentation/master
+[irc]: https://webchat.freenode.net/?channels=%23zig
+[reddit]: https://www.reddit.com/r/Zig
+[stack-overflow]: https://stackoverflow.com/questions/tagged/zig
+[zig-guide]: https://zig.guide/
+[ziglings]: https://codeberg.org/ziglings/exercises

zig/resistor-color/README.md

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+# Resistor Color
+
+Welcome to Resistor Color on Exercism's Zig Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## 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
+
+## Source
+
+### Created by
+
+- @massivelivefun
+
+### Based on
+
+Maud de Vries, Erik Schierboom - https://github.com/exercism/problem-specifications/issues/1458

zig/resistor-color/resistor_color.zig

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+const std = @import("std");
+
+pub const ColorBand = enum(usize) {
+    black,
+    brown,
+    red,
+    orange,
+    yellow,
+    green,
+    blue,
+    violet,
+    grey,
+    white
+};
+
+pub fn colorCode(color: ColorBand) usize {
+    return @intFromEnum(color);
+}
+
+pub fn colors() []const ColorBand {
+    return std.enums.values(ColorBand);
+}

zig/resistor-color/test_resistor_color.zig

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+const std = @import("std");
+const testing = std.testing;
+
+const resistor_color = @import("resistor_color.zig");
+const ColorBand = resistor_color.ColorBand;
+
+test "black" {
+    const expected: usize = 0;
+    const actual = resistor_color.colorCode(.black);
+    try testing.expectEqual(expected, actual);
+}
+
+test "white" {
+    const expected: usize = 9;
+    const actual = resistor_color.colorCode(.white);
+    try testing.expectEqual(expected, actual);
+}
+
+test "orange" {
+    const expected: usize = 3;
+    const actual = resistor_color.colorCode(.orange);
+    try testing.expectEqual(expected, actual);
+}
+
+test "colors" {
+    const expected = &[_]ColorBand{
+        .black, .brown, .red,    .orange, .yellow,
+        .green, .blue,  .violet, .grey,   .white,
+    };
+    const actual = resistor_color.colors();
+    try testing.expectEqualSlices(ColorBand, expected, actual);
+}