Add resistor-color (#319)

* Add resistor-color

* Fix typo in test suite

* Apply suggestions from code review

---------

Co-authored-by: Nenad <[email protected]>

config.json

@@ -709,6 +709,14 @@
         "prerequisites": [],
         "difficulty": 10
       },
+      {
+        "slug": "resistor-color",
+        "name": "Resistor Color",
+        "uuid": "cc590998-e7a1-4972-bd32-cf13bf64c909",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 2
+      },
       {
         "slug": "resistor-color-duo",
         "name": "Resistor Color Duo",

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

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

@@ -0,0 +1,22 @@
+{
+  "authors": [
+    "BNAndras"
+  ],
+  "files": {
+    "solution": [
+      "src/lib.cairo"
+    ],
+    "test": [
+      "tests/resistor_color.cairo"
+    ],
+    "example": [
+      ".meta/example.cairo"
+    ],
+    "invalidator": [
+      "Scarb.toml"
+    ]
+  },
+  "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"
+}

exercises/practice/resistor-color/.meta/example.cairo

@@ -0,0 +1,43 @@
+#[derive(Drop, Debug, PartialEq)]
+pub enum Color {
+    Black,
+    Brown,
+    Red,
+    Orange,
+    Yellow,
+    Green,
+    Blue,
+    Violet,
+    Grey,
+    White,
+}
+
+pub fn color_code(color: Color) -> u8 {
+    match color {
+        Color::Black => 0,
+        Color::Brown => 1,
+        Color::Red => 2,
+        Color::Orange => 3,
+        Color::Yellow => 4,
+        Color::Green => 5,
+        Color::Blue => 6,
+        Color::Violet => 7,
+        Color::Grey => 8,
+        Color::White => 9,
+    }
+}
+
+pub fn colors() -> Array<Color> {
+    array![
+        Color::Black,
+        Color::Brown,
+        Color::Red,
+        Color::Orange,
+        Color::Yellow,
+        Color::Green,
+        Color::Blue,
+        Color::Violet,
+        Color::Grey,
+        Color::White
+    ]
+}

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"

exercises/practice/resistor-color/Scarb.toml

@@ -0,0 +1,7 @@
+[package]
+name = "resistor_color"
+version = "0.1.0"
+edition = "2024_07"
+
+[dev-dependencies]
+cairo_test = "2.8.2"

exercises/practice/resistor-color/src/lib.cairo

@@ -0,0 +1,21 @@
+#[derive(Debug, Drop)]
+pub enum Color {
+    Black,
+    Brown,
+    Red,
+    Orange,
+    Yellow,
+    Green,
+    Blue,
+    Violet,
+    Grey,
+    White,
+}
+
+pub fn color_code(color: Color) -> u8 {
+    panic!("implement `colors`")
+}
+
+pub fn colors() -> Array<Color> {
+    panic!("implement `colors`")
+}

exercises/practice/resistor-color/tests/resistor_color.cairo

@@ -0,0 +1,44 @@
+use resistor_color::{color_code, colors, Color};
+
+
+#[test]
+fn black() {
+    let output = color_code(Color::Black);
+    let expected = 0;
+    assert_eq!(output, expected);
+}
+
+#[test]
+#[ignore]
+fn white() {
+    let output = color_code(Color::White);
+    let expected = 9;
+    assert_eq!(output, expected);
+}
+
+#[test]
+#[ignore]
+fn orange() {
+    let output = color_code(Color::Orange);
+    let expected = 3;
+    assert_eq!(output, expected);
+}
+
+#[test]
+#[ignore]
+fn test_colors() {
+    let output = colors();
+    let expected = array![
+        Color::Black,
+        Color::Brown,
+        Color::Red,
+        Color::Orange,
+        Color::Yellow,
+        Color::Green,
+        Color::Blue,
+        Color::Violet,
+        Color::Grey,
+        Color::White
+    ];
+    assert_eq!(output, expected);
+}