Zig: completed Resistor Color Duo

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

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+{
+  "authors": [
+    "massivelivefun"
+  ],
+  "files": {
+    "solution": [
+      "resistor_color_duo.zig"
+    ],
+    "test": [
+      "test_resistor_color_duo.zig"
+    ],
+    "example": [
+      ".meta/example.zig"
+    ]
+  },
+  "blurb": "Convert color codes, as used on resistors, to a numeric value.",
+  "source": "Maud de Vries, Erik Schierboom",
+  "source_url": "https://github.com/exercism/problem-specifications/issues/1464"
+}

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

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+{"track":"zig","exercise":"resistor-color-duo","id":"4904409bf2c744acb829962709a345ef","url":"https://exercism.org/tracks/zig/exercises/resistor-color-duo","handle":"Chomp1295","is_requester":true,"auto_approve":false}

zig/resistor-color-duo/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_duo.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-duo/README.md

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+# Resistor Color Duo
+
+Welcome to Resistor Color Duo 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.
+For example, if they printed a brown band (value 1) followed by a green band (value 5), it would translate to the number 15.
+
+In this exercise you are going to create a helpful program so that you don't have to remember the values of the bands.
+The program will take color names as input and output a two digit number, even if the input is more than two colors!
+
+The band 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
+
+From the example above:
+brown-green should return 15, and
+brown-green-violet should return 15 too, ignoring the third color.
+
+## Source
+
+### Created by
+
+- @massivelivefun
+
+### Based on
+
+Maud de Vries, Erik Schierboom - https://github.com/exercism/problem-specifications/issues/1464

zig/resistor-color-duo/resistor_color_duo.zig

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+pub const ColorBand = enum(usize) { black = 0, brown = 1, red = 2, orange = 3, yellow = 4, green = 5, blue = 6, violet = 7, grey = 8, white = 9 };
+
+pub fn colorCode(comptime colors: [2]ColorBand) usize {
+    return 10 * @intFromEnum(colors[0]) + @intFromEnum(colors[1]);
+}

zig/resistor-color-duo/test_resistor_color_duo.zig

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+const std = @import("std");
+const testing = std.testing;
+
+const resistor_color_duo = @import("resistor_color_duo.zig");
+const ColorBand = resistor_color_duo.ColorBand;
+
+test "brown and black" {
+    const array = [_]ColorBand{ .brown, .black };
+    const expected: usize = 10;
+    const actual = resistor_color_duo.colorCode(array);
+    try testing.expectEqual(expected, actual);
+}
+
+test "blue and grey" {
+    const array = [_]ColorBand{ .blue, .grey };
+    const expected: usize = 68;
+    const actual = resistor_color_duo.colorCode(array);
+    try testing.expectEqual(expected, actual);
+}
+
+test "yellow and violet" {
+    const array = [_]ColorBand{ .yellow, .violet };
+    const expected: usize = 47;
+    const actual = resistor_color_duo.colorCode(array);
+    try testing.expectEqual(expected, actual);
+}
+
+test "white and red" {
+    const array = [_]ColorBand{ .white, .red };
+    const expected: usize = 92;
+    const actual = resistor_color_duo.colorCode(array);
+    try testing.expectEqual(expected, actual);
+}
+
+test "orange and orange" {
+    const array = [_]ColorBand{ .orange, .orange };
+    const expected: usize = 33;
+    const actual = resistor_color_duo.colorCode(array);
+    try testing.expectEqual(expected, actual);
+}
+
+test "black and brown, one-digit" {
+    const array = [_]ColorBand{ .black, .brown };
+    const expected: usize = 1;
+    const actual = resistor_color_duo.colorCode(array);
+    try testing.expectEqual(expected, actual);
+}