Add resistor-color exercise (#758)

Author: ErikSchierboom

config.json

@@ -701,6 +701,17 @@
           "conditionals"
         ]
       },
+      {
+        "slug": "resistor-color",
+        "name": "Resistor Color",
+        "uuid": "a5db6df9-88e3-4188-a45e-f25ad6565083",
+        "practices": [],
+        "prerequisites": [
+          "strings",
+          "vectors"
+        ],
+        "difficulty": 2
+      },
       {
         "slug": "word-count",
         "name": "Word Count",

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 +1,19 @@
+{
+  "authors": [
+    "erikschierboom"
+  ],
+  "files": {
+    "solution": [
+      "src/resistor_color.clj"
+    ],
+    "test": [
+      "test/resistor_color_test.clj"
+    ],
+    "example": [
+      ".meta/example.clj"
+    ]
+  },
+  "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.clj

@@ -0,0 +1,5 @@
+(ns resistor-color)
+
+(def colors ["black" "brown" "red" "orange" "yellow" "green" "blue" "violet" "grey" "white"])
+
+(defn color-code [color] (.indexOf colors color))

exercises/practice/resistor-color/.meta/generator.tpl

@@ -0,0 +1,14 @@
+(ns resistor-color-test
+  (:require [clojure.test :refer [deftest testing is]]
+            resistor-color))
+{{#test_cases.colors}}
+(deftest colors_test_{{idx}}
+  (testing {{string description}}
+    (is (= {{expected}}
+           resistor-color/colors))))
+{{/test_cases.colors~}}
+{{#test_cases.colorCode}}
+(deftest color-code_test_{{idx}}
+  (testing {{string description}}
+    (is (= {{expected}} (resistor-color/color-code {{string input.color}})))))
+{{/test_cases.colorCode~}}

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/deps.edn

@@ -0,0 +1,6 @@
+{:aliases {:test {:extra-paths ["test"]
+                 :extra-deps {io.github.cognitect-labs/test-runner 
+                              {:git/url "https://github.com/cognitect-labs/test-runner.git"
+                               :sha "705ad25bbf0228b1c38d0244a36001c2987d7337"}}
+                 :main-opts ["-m" "cognitect.test-runner"]
+                 :exec-fn cognitect.test-runner.api/test}}}

exercises/practice/resistor-color/project.clj

@@ -0,0 +1,4 @@
+(defproject resistor-color "0.1.0-SNAPSHOT"
+  :description "resistor-color exercise."
+  :url "https://github.com/exercism/clojure/tree/main/exercises/practice/resistor-color"
+  :dependencies [[org.clojure/clojure "1.11.1"]])

exercises/practice/resistor-color/src/resistor_color.clj

@@ -0,0 +1,11 @@
+(ns resistor-color)
+
+(def colors
+  ;; definition value
+  )
+
+(defn color-code
+  "Returns the numerical value associated with the given color"
+  [color]
+  ;; function body
+  )

exercises/practice/resistor-color/test/resistor_color_test.clj

@@ -0,0 +1,20 @@
+(ns resistor-color-test
+  (:require [clojure.test :refer [deftest testing is]]
+            resistor-color))
+
+(deftest colors_test_1
+  (testing "Colors"
+    (is (= ["black" "brown" "red" "orange" "yellow" "green" "blue" "violet" "grey" "white"]
+           resistor-color/colors))))
+
+(deftest color-code_test_1
+  (testing "Color codes - Black"
+    (is (= 0 (resistor-color/color-code "black")))))
+
+(deftest color-code_test_2
+  (testing "Color codes - White"
+    (is (= 9 (resistor-color/color-code "white")))))
+
+(deftest color-code_test_3
+  (testing "Color codes - Orange"
+    (is (= 3 (resistor-color/color-code "orange")))))