Add exercise: resistor-color (#648)

And replace it in place of leap as core

config.json

@@ -19,15 +19,14 @@
       ]
     },
     {
-      "slug": "leap",
-      "uuid": "7c8294ee-5924-4bf8-a72f-31d0e2d7d9a0",
+      "slug": "resistor-color",
+      "uuid": "53be6837-c224-45f1-bff3-d7f74d6285ce",
       "core": true,
       "unlocked_by": null,
       "difficulty": 1,
       "topics": [
-        "booleans",
-        "integers",
-        "logic"
+        "arrays",
+        "strings"
       ]
     },
     {
@@ -238,11 +237,23 @@
         "text_formatting"
       ]
     },
+    {
+      "slug": "leap",
+      "uuid": "7c8294ee-5924-4bf8-a72f-31d0e2d7d9a0",
+      "core": false,
+      "unlocked_by": "resistor-color",
+      "difficulty": 1,
+      "topics": [
+        "booleans",
+        "integers",
+        "logic"
+      ]
+    },
     {
       "slug": "reverse-string",
       "uuid": "e84c97eb-dbec-487c-b99f-ae9924e16293",
       "core": false,
-      "unlocked_by": "leap",
+      "unlocked_by": "resistor-color",
       "difficulty": 2,
       "topics": [
         "for",
@@ -254,7 +265,7 @@
       "slug": "triangle",
       "uuid": "ed3ca73a-a0f0-46b8-8013-8b6d20758c8f",
       "core": false,
-      "unlocked_by": "leap",
+      "unlocked_by": "resistor-color",
       "difficulty": 3,
       "topics": [
         "control_flow_conditionals",
@@ -267,7 +278,7 @@
       "slug": "collatz-conjecture",
       "uuid": "b8dacb3a-51d0-4da7-a6d2-aa29867e2b8c",
       "core": false,
-      "unlocked_by": "leap",
+      "unlocked_by": "resistor-color",
       "difficulty": 3,
       "topics": [
         "control_flow_conditionals",

exercises/resistor-color/.eslintrc

@@ -0,0 +1,26 @@
+{
+  "root": true,
+  "parser": "babel-eslint",
+  "parserOptions": {
+    "ecmaVersion": 7,
+    "sourceType": "module"
+  },
+  "env": {
+    "es6": true,
+    "node": true,
+    "jest": true
+  },
+  "extends": [
+    "eslint:recommended",
+    "plugin:import/errors",
+    "plugin:import/warnings"
+  ],
+  "rules": {
+    "linebreak-style": "off",
+
+    "import/extensions": "off",
+    "import/no-default-export": "off",
+    "import/no-unresolved": "off",
+    "import/prefer-default-export": "off"
+  }
+}

exercises/resistor-color/README.md

@@ -0,0 +1,52 @@
+# Resistor Color
+
+Resistors have color coded bands, where each color maps to a number. The first 2 bands of a resistor have a simple encoding scheme: each color maps to a single number.
+
+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
+
+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](https://en.wikipedia.org/wiki/Electronic_color_code)
+
+## 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`.
+
+## Submitting Incomplete Solutions
+
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

exercises/resistor-color/babel.config.js

@@ -0,0 +1,14 @@
+module.exports = {
+  presets: [
+    [
+      '@babel/env',
+      {
+        targets: {
+          node: 'current',
+        },
+        useBuiltIns: false,
+      },
+
+    ],
+  ],
+};

exercises/resistor-color/example.js

@@ -0,0 +1,6 @@
+export const COLORS = [
+  'black', 'brown', 'red', 'orange', 'yellow', 'green',
+  'blue', 'violet', 'grey', 'white',
+];
+
+export const colorCode = color => COLORS.indexOf(color)

exercises/resistor-color/package.json

@@ -0,0 +1,34 @@
+{
+  "name": "exercism-javascript",
+  "version": "0.0.0",
+  "description": "Exercism exercises in Javascript.",
+  "author": "Katrina Owen",
+  "private": true,
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/exercism/javascript"
+  },
+  "devDependencies": {
+    "@babel/cli": "^7.2.3",
+    "@babel/core": "^7.4.0",
+    "@babel/preset-env": "^7.4.2",
+    "babel-eslint": "^10.0.1",
+    "babel-jest": "^24.5.0",
+    "eslint": "^5.15.3",
+    "eslint-plugin-import": "^2.16.0",
+    "jest": "^24.5.0"
+  },
+  "jest": {
+    "modulePathIgnorePatterns": [
+      "package.json"
+    ]
+  },
+  "scripts": {
+    "test": "jest --no-cache ./*",
+    "watch": "jest --no-cache --watch ./*",
+    "lint": "eslint .",
+    "lint-test": "eslint . && jest --no-cache ./* "
+  },
+  "license": "MIT",
+  "dependencies": {}
+}

exercises/resistor-color/resistor-color.spec.js

@@ -0,0 +1,21 @@
+import { colorCode, COLORS } from './resistor-color'
+
+describe('ResistorColor', () => {
+  describe('Color codes', () => {
+    test('Black', () => {
+      expect(colorCode("black")).toEqual(0)
+    })
+
+    xtest('White', () => {
+      expect(colorCode("white")).toEqual(9)
+    })
+
+    xtest('Orange', () => {
+      expect(colorCode("orange")).toEqual(3)
+    })
+  })
+
+  xtest('Colors', () => {
+    expect(COLORS).toEqual(["black","brown","red","orange","yellow","green","blue","violet","grey","white"])
+  })
+})