[New Exercise]: Resistor color

config.json

@@ -384,6 +384,14 @@
         "prerequisites": [],
         "difficulty": 1
       },
+      {
+        "slug": "resistor-color",
+        "name": "Resistor Color",
+        "uuid": "2043f397-4337-4d3f-867e-50e344b790eb",
+        "practices": [],
+        "prerequisites": [],
+        "difficulty": 1
+      },
       {
         "slug": "darts",
         "name": "Darts",

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/Sources/ResistorColor/ResistorColorExample.swift

@@ -0,0 +1,48 @@
+import Foundation
+
+enum Color: String, CaseIterable {
+    case black
+    case brown
+    case red
+    case orange
+    case yellow
+    case green
+    case blue
+    case violet
+    case grey
+    case white
+}
+
+enum ResistorColorError: Error {
+    case unknownColor
+}
+
+enum ResistorColor {
+
+    static func colorCode(for name: String) throws -> Int {
+        guard let color = Color(rawValue: name) else {
+            throw ResistorColorError.unknownColor
+        }
+        return code(for: color)
+    }
+
+    static var colors: [String] {
+        return Array(Color.allCases.map { $0.rawValue })
+    }
+
+}
+
+fileprivate func code(for color: Color) -> Int {
+    switch color {
+        case .black: return 0
+        case .brown: return 1
+        case .red: return 2
+        case .orange: return 3
+        case .yellow: return 4
+        case .green: return 5
+        case .blue: return 6
+        case .violet: return 7
+        case .grey: return 8
+        case .white: return 9
+    }
+}

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

@@ -0,0 +1,19 @@
+{
+  "authors": [
+    "Sencudra"
+  ],
+  "files": {
+    "solution": [
+      "Sources/ResistorColor/ResistorColor.swift"
+    ],
+    "test": [
+      "Tests/ResistorColorTests/ResistorColorTests.swift"
+    ],
+    "example": [
+      ".meta/Sources/ResistorColor/ResistorColorExample.swift"
+    ]
+  },
+  "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/template.swift

@@ -0,0 +1,32 @@
+import Testing
+import Foundation
+@testable import {{ exercise | camelCase }}
+
+let RUNALL = Bool(ProcessInfo.processInfo.environment["RUNALL", default: "false"]) ?? false
+
+@Suite struct {{ exercise | camelCase }}Tests {
+
+    {% for case in cases.first.cases %}
+    {% if forloop.first -%}
+        @Test("{{case.description}}")
+    {% else -%}
+        @Test("{{case.description}}", .enabled(if: RUNALL))
+    {% endif -%}
+    func test{{ case.description | camelCase }}() throws {
+        #expect(try ResistorColor.{{ case.property }}(for: "{{ case.input.color }}") == {{ case.expected }})
+    }
+    {% endfor -%}
+
+    {% for case in cases %}
+    {% if forloop.first -%}
+        {% continue %}
+    {% endif %}
+        @Test("{{case.description}}", .enabled(if: RUNALL))
+        func test{{ case.description | camelCase }}() {
+    {% if case.property == "colors" -%}
+            #expect(ResistorColor.{{ case.property }} == {{ case.expected | toStringArray }})
+    {% endif -%}
+        }
+    {% endfor -%}
+
+}

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/Package.swift

@@ -0,0 +1,21 @@
+// swift-tools-version:6.0
+
+import PackageDescription
+
+let package = Package(
+  name: "ResistorColor",
+  products: [
+    .library(
+      name: "ResistorColor",
+      targets: ["ResistorColor"])
+  ],
+  dependencies: [],
+  targets: [
+    .target(
+      name: "ResistorColor",
+      dependencies: []),
+    .testTarget(
+      name: "ResistorColorTests",
+      dependencies: ["ResistorColor"]),
+  ]
+)

exercises/practice/resistor-color/Sources/ResistorColor/ResistorColor.swift

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+import Foundation
+
+enum ResistorColor {
+    // Write your code for the 'ResistorColor' exercise in this file.
+}

exercises/practice/resistor-color/Tests/ResistorColorTests/ResistorColorTests.swift

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+import Foundation
+import Testing
+
+@testable import ResistorColor
+
+let RUNALL = Bool(ProcessInfo.processInfo.environment["RUNALL", default: "false"]) ?? false
+
+@Suite struct ResistorColorTests {
+
+  @Test("Black")
+  func testBlack() throws {
+    #expect(try ResistorColor.colorCode(for: "black") == 0)
+  }
+
+  @Test("White", .enabled(if: RUNALL))
+  func testWhite() throws {
+    #expect(try ResistorColor.colorCode(for: "white") == 9)
+  }
+
+  @Test("Orange", .enabled(if: RUNALL))
+  func testOrange() throws {
+    #expect(try ResistorColor.colorCode(for: "orange") == 3)
+  }
+
+  @Test("Colors", .enabled(if: RUNALL))
+  func testColors() {
+    #expect(
+      ResistorColor.colors == [
+        "black", "brown", "red", "orange", "yellow", "green", "blue", "violet", "grey", "white",
+      ])
+  }
+}