new exercise: resistor-color-duo (#305)

* new exercise: resistor-color-duo

config.json

@@ -29,6 +29,17 @@
         "text_formatting"
       ]
     },
+    {
+      "slug": "resistor-color-duo",
+      "uuid": "78645d36-12be-11ea-8d71-362b9e155667",
+      "core": true,
+      "unlocked_by": null,
+      "difficulty": 2,
+      "topics": [
+        "strings",
+        "arrays"
+      ]
+    },
     {
       "slug": "leap",
       "uuid": "fb80f76c-42da-4f62-9f0f-8c85d984908b",

exercises/resistor-color-duo/.eslintignore

@@ -0,0 +1,8 @@
+bin/*
+dist/*
+docs/*
+node_modules/*
+production_node_modules/*
+test/fixtures/*
+tmp/*
+jest.config.js

exercises/resistor-color-duo/.eslintrc

@@ -0,0 +1,64 @@
+{
+  "root": true,
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "project": "./tsconfig.json",
+    "ecmaFeatures": {
+      "jsx": true
+    },
+    "ecmaVersion": 2018,
+    "sourceType": "module"
+  },
+  "env": {
+    "browser": true,
+    "es6": true
+  },
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/eslint-recommended",
+    "plugin:@typescript-eslint/recommended",
+  ],
+  "globals": {
+    "Atomics": "readonly",
+    "SharedArrayBuffer": "readonly"
+  },
+  "plugins": [
+    "@typescript-eslint"
+  ],
+  "rules": {
+    "@typescript-eslint/array-type": "off", // Styling not forced upon the student
+    "@typescript-eslint/explicit-function-return-type": [
+      "warn", {
+        "allowExpressions": false,
+        "allowTypedFunctionExpressions": true,
+        "allowHigherOrderFunctions": true
+      }
+    ], // Prevent bugs
+    "@typescript-eslint/explicit-member-accessibility": "off", // Styling not forced upon the student
+    "@typescript-eslint/indent": "off", // Styling not forced upon the student
+    "@typescript-eslint/no-inferrable-types": [
+      "error", {
+        "ignoreParameters": true
+      }
+    ],
+    "@typescript-eslint/member-delimiter-style": "off", // Styling not forced upon the student
+    "@typescript-eslint/no-non-null-assertion": "off",
+    "@typescript-eslint/no-parameter-properties": [
+      "warn", {
+        "allows": [
+          "private", "protected", "public",
+          "private readonly", "protected readonly", "public readonly"
+        ]
+      }
+    ], // only disallow readonly without an access modifier
+    "@typescript-eslint/no-unused-vars": "off", // Covered by the tsc compiler (noUnusedLocals)
+    "@typescript-eslint/no-use-before-define": [
+      "error", {
+        "functions": false,
+        "typedefs": false
+      }
+    ], // Prevent bugs, not styling
+    "semi": "off", // Always disable base-rule
+    "@typescript-eslint/semi": "off" // Styling not forced upon student
+  }
+}

exercises/resistor-color-duo/README.md

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+# Resistor Color Duo
+
+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. 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 colors are mapped to the numbers from 0 to 9 in the sequence:
+Black - Brown - Red - Orange - Yellow - Green - Blue - Violet - Grey - White
+
+From the example above:
+brown-green should return 15
+brown-green-violet should return 15 too, ignoring the third color.
+
+## Setup
+
+Go through the setup instructions for Javascript to
+install the necessary dependencies:
+
+[https://exercism.io/tracks/javascript/installation](https://exercism.io/tracks/javascript/installation)
+
+## Requirements
+
+Install assignment dependencies:
+
+```bash
+$ npm install
+```
+
+## Making the test suite pass
+
+Execute the tests with:
+
+```bash
+$ npm test
+```
+
+In the test suites all tests but the first have been skipped.
+
+Once you get a test passing, you can enable the next one by
+changing `xtest` to `test`.
+
+## Source
+
+Maud de Vries, Erik Schierboom [https://github.com/exercism/problem-specifications/issues/1464](https://github.com/exercism/problem-specifications/issues/1464)
+
+## Submitting Incomplete Solutions
+
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

exercises/resistor-color-duo/jest.config.js

@@ -0,0 +1,21 @@
+module.exports = {
+  verbose: true,
+  projects: [
+    '<rootDir>'
+  ],
+  testMatch: [
+    "**/__tests__/**/*.[jt]s?(x)",
+    "**/test/**/*.[jt]s?(x)",
+    "**/?(*.)+(spec|test).[jt]s?(x)"
+  ],
+  testPathIgnorePatterns: [
+    '/(?:production_)?node_modules/',
+    '.d.ts$',
+    '<rootDir>/test/fixtures',
+    '<rootDir>/test/helpers',
+    '__mocks__'
+  ],
+  transform: {
+    '^.+\\.[jt]sx?$': 'ts-jest',
+  },
+};