Implement D&D Character Exercise

config.json

@@ -1328,6 +1328,17 @@
         "math"
       ]
     },
+    {
+      "slug": "dnd-character",
+      "uuid": "b373e13c-f179-4b36-b6e8-2a0f41540344",
+      "core": false,
+      "unlocked_by": null,
+      "difficulty": 2,
+      "topics": [
+        "classes", 
+        "randomness"
+      ]
+    },
     {
       "slug": "trinary",
       "uuid": "1acf1d2d-a25e-4576-94de-0470abc872d9",

exercises/accumulate/package.json

@@ -31,4 +31,4 @@
   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/acronym/package.json

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-}
+}

exercises/all-your-base/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/allergies/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/alphametics/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/anagram/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/armstrong-numbers/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/atbash-cipher/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/beer-song/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/binary-search-tree/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/binary-search/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/binary/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/bob/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/bowling/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/change/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/circular-buffer/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/clock/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/collatz-conjecture/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/complex-numbers/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/connect/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/crypto-square/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/custom-set/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/darts/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/diamond/package.json

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   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/difference-of-squares/package.json

@@ -31,4 +31,4 @@
   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/diffie-hellman/package.json

@@ -31,4 +31,4 @@
   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/dnd-character/.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/dnd-character/README.md

@@ -0,0 +1,62 @@
+# D&D Character
+
+For a game of [Dungeons & Dragons][DND], each player starts by generating a character they can play with. This character has, among other things, six abilities; strength, dexterity, constitution, intelligence, wisdom and charisma. These six abilities have scores that are determined randomly. You do this by rolling four 6-sided dice and record the sum of the largest three dice. You do this six times, once for each ability.
+
+Your character's initial hitpoints are 10 + your character's constitution modifier. You find your character's constitution modifier by subtracting 10 from your character's constitution, divide by 2 and round down.
+
+Write a random character generator that follows the rules above.
+
+For example, the six throws of four dice may look like:
+
+* 5, 3, 1, 6: You discard the 1 and sum 5 + 3 + 6 = 14, which you assign to strength.
+* 3, 2, 5, 3: You discard the 2 and sum 3 + 5 + 3 = 11, which you assign to dexterity.
+* 1, 1, 1, 1: You discard the 1 and sum 1 + 1 + 1 = 3, which you assign to constitution.
+* 2, 1, 6, 6: You discard the 1 and sum 2 + 6 + 6 = 14, which you assign to intelligence.
+* 3, 5, 3, 4: You discard the 3 and sum 5 + 3 + 4 = 12, which you assign to wisdom.
+* 6, 6, 6, 6: You discard the 6 and sum 6 + 6 + 6 = 18, which you assign to charisma.
+
+Because constitution is 3, the constitution modifier is -4 and the hitpoints are 6.
+
+## Notes
+
+Most programming languages feature (pseudo-)random generators, but few programming languages are designed to roll dice. One such language is [Troll].
+
+[DND]: https://en.wikipedia.org/wiki/Dungeons_%26_Dragons
+[Troll]: http://hjemmesider.diku.dk/~torbenm/Troll/
+
+## 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
+
+Inspired by an exercise created by a professor Della Paolera in Argentina
+
+## Submitting Incomplete Solutions
+
+It's possible to submit an incomplete solution so you can see how others have
+completed the exercise.

exercises/dnd-character/babel.config.js

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

exercises/dnd-character/dnd-character.spec.js

@@ -0,0 +1,117 @@
+import { Character, abilityModifier } from './dnd-character';
+
+describe('D&D Character', () => {
+  describe('Ability modifier', () => {
+    test('ability modifier for score 3 is -4', () => {
+      expect(abilityModifier(3)).toEqual(-4);
+    });
+
+    test('ability modifier for score 4 is -3', () => {
+      expect(abilityModifier(4)).toEqual(-3);
+    });
+
+    test('ability modifier for score 5 is -3', () => {
+      expect(abilityModifier(5)).toEqual(-3);
+    });
+
+    test('ability modifier for score 6 is -2', () => {
+      expect(abilityModifier(6)).toEqual(-2);
+    });
+
+    test('ability modifier for score 7 is -2', () => {
+      expect(abilityModifier(7)).toEqual(-2);
+    });
+
+    test('ability modifier for score 8 is -1', () => {
+      expect(abilityModifier(8)).toEqual(-1);
+    });
+
+    test('ability modifier for score 9 is -1', () => {
+      expect(abilityModifier(9)).toEqual(-1);
+    });
+
+    test('ability modifier for score 10 is 0', () => {
+      expect(abilityModifier(10)).toEqual(0);
+    });
+
+    test('ability modifier for score 11 is 0', () => {
+      expect(abilityModifier(11)).toEqual(0);
+    });
+
+    test('ability modifier for score 12 is 1', () => {
+      expect(abilityModifier(12)).toEqual(1);
+    });
+
+    test('ability modifier for score 13 is 1', () => {
+      expect(abilityModifier(13)).toEqual(1);
+    });
+
+    test('ability modifier for score 14 is 2', () => {
+      expect(abilityModifier(14)).toEqual(2);
+    });
+
+    test('ability modifier for score 15 is 2', () => {
+      expect(abilityModifier(15)).toEqual(2);
+    });
+
+    test('ability modifier for score 16 is 3', () => {
+      expect(abilityModifier(16)).toEqual(3);
+    });
+
+    test('ability modifier for score 17 is 3', () => {
+      expect(abilityModifier(17)).toEqual(3);
+    });
+
+    test('ability modifier for score 18 is 4', () => {
+      expect(abilityModifier(18)).toEqual(4);
+    });
+
+    test('ability score less than 3 throws error', () => {
+      expect(() => abilityModifier(2)).toThrow(
+        new Error('Ability scores must be at least 3')
+      );
+    });
+
+    test('ability score greater than 18 throws error', () => {
+      expect(() => abilityModifier(19)).toThrow(
+        new Error('Ability scores can be at most 18')
+      );
+    });
+  });
+
+  describe('Ability scores calculated properly', () => {
+    test('ability within range', () => {
+      expect(Character.rollAbility()).toBeLessThanOrEqual(18);
+      expect(Character.rollAbility()).toBeGreaterThanOrEqual(3);
+    });
+
+    test('ability scores only calculated once', () => {
+      const Drizzt = new Character();
+
+      expect(Drizzt.strength).toEqual(Drizzt.strength);
+    });
+  });
+
+  describe('Random character is valid', () => {
+    test('character is valid', () => {
+      const Drizzt = new Character();
+
+      expect(Drizzt.strength).toBeLessThanOrEqual(18);
+      expect(Drizzt.strength).toBeGreaterThanOrEqual(3);
+      expect(Drizzt.dexterity).toBeLessThanOrEqual(18);
+      expect(Drizzt.dexterity).toBeGreaterThanOrEqual(3);
+      expect(Drizzt.constitution).toBeLessThanOrEqual(18);
+      expect(Drizzt.constitution).toBeGreaterThanOrEqual(3);
+      expect(Drizzt.intelligence).toBeLessThanOrEqual(18);
+      expect(Drizzt.intelligence).toBeGreaterThanOrEqual(3);
+      expect(Drizzt.wisdom).toBeLessThanOrEqual(18);
+      expect(Drizzt.wisdom).toBeGreaterThanOrEqual(3);
+      expect(Drizzt.charisma).toBeLessThanOrEqual(18);
+      expect(Drizzt.charisma).toBeGreaterThanOrEqual(3);
+
+      expect(Drizzt.hitpoints).toEqual(
+        10 + abilityModifier(Drizzt.constitution)
+      );
+    });
+  });
+});

exercises/dnd-character/example.js

@@ -0,0 +1,36 @@
+export class Character {
+  constructor() {
+    this.strength = Character.rollAbility();
+    this.dexterity = Character.rollAbility();
+    this.constitution = Character.rollAbility();
+    this.intelligence = Character.rollAbility();
+    this.wisdom = Character.rollAbility();
+    this.charisma = Character.rollAbility();
+    this.hitpoints = 10 + abilityModifier(this.constitution);
+  }
+
+  static rollAbility() {
+    let diceRolls = [];
+
+    for (let i = 0; i < 4; i++) {
+      diceRolls.push(Math.floor(Math.random() * 5) + 1);
+    }
+
+    return diceRolls
+      .sort()
+      .slice(1)
+      .reduce((partialSum, num) => partialSum + num, 0);
+  }
+}
+
+export const abilityModifier = abilityScore => {
+  if (abilityScore < 3) {
+    throw new Error('Ability scores must be at least 3');
+  }
+
+  if (abilityScore > 18) {
+    throw new Error('Ability scores can be at most 18');
+  }
+
+  return Math.floor((abilityScore - 10) / 2);
+};

exercises/dnd-character/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/etl/package.json

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   "dependencies": {}
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+}

exercises/flatten-array/package.json

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exercises/food-chain/package.json

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exercises/forth/package.json

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exercises/gigasecond/package.json

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exercises/grade-school/package.json

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exercises/grains/package.json

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exercises/hamming/package.json

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exercises/hello-world/package.json

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exercises/hexadecimal/package.json

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exercises/high-scores/package.json

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exercises/house/package.json

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exercises/isbn-verifier/package.json

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exercises/isogram/package.json

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exercises/kindergarten-garden/package.json

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exercises/largest-series-product/package.json

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exercises/leap/package.json

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exercises/linked-list/package.json

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exercises/list-ops/package.json

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exercises/luhn/package.json

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exercises/matching-brackets/package.json

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exercises/matrix/package.json

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exercises/meetup/package.json

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exercises/minesweeper/package.json

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exercises/nth-prime/package.json

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exercises/nucleotide-count/package.json

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exercises/ocr-numbers/package.json

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exercises/octal/package.json

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exercises/palindrome-products/package.json

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exercises/pangram/package.json

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exercises/pascals-triangle/package.json

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exercises/perfect-numbers/package.json

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exercises/phone-number/package.json

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exercises/pig-latin/package.json

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exercises/point-mutations/package.json

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exercises/prime-factors/package.json

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exercises/protein-translation/package.json

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exercises/proverb/package.json

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exercises/pythagorean-triplet/package.json

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exercises/queen-attack/package.json

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exercises/raindrops/package.json

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exercises/rational-numbers/package.json

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exercises/react/package.json

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exercises/rectangles/package.json

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exercises/resistor-color-duo/package.json

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exercises/resistor-color/package.json

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exercises/reverse-string/package.json

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exercises/rna-transcription/package.json

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exercises/robot-name/package.json

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exercises/robot-simulator/package.json

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exercises/roman-numerals/package.json

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exercises/rotational-cipher/package.json

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exercises/run-length-encoding/package.json

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exercises/saddle-points/package.json

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exercises/say/package.json

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exercises/scrabble-score/package.json

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exercises/secret-handshake/package.json

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exercises/series/package.json

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exercises/sieve/package.json

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exercises/simple-cipher/package.json

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exercises/simple-linked-list/package.json

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+}

exercises/space-age/package.json

@@ -31,4 +31,4 @@
   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/spiral-matrix/package.json

@@ -31,4 +31,4 @@
   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/strain/package.json

@@ -31,4 +31,4 @@
   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/sublist/package.json

@@ -31,4 +31,4 @@
   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/sum-of-multiples/package.json

@@ -31,4 +31,4 @@
   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/transpose/package.json

@@ -31,4 +31,4 @@
   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/triangle/package.json

@@ -31,4 +31,4 @@
   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/trinary/package.json

@@ -31,4 +31,4 @@
   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/twelve-days/package.json

@@ -31,4 +31,4 @@
   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/two-bucket/package.json

@@ -31,4 +31,4 @@
   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/two-fer/package.json

@@ -31,4 +31,4 @@
   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/variable-length-quantity/package.json

@@ -31,4 +31,4 @@
   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/word-count/package.json

@@ -31,4 +31,4 @@
   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/word-search/package.json

@@ -31,4 +31,4 @@
   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/wordy/package.json

@@ -31,4 +31,4 @@
   },
   "license": "MIT",
   "dependencies": {}
-}
+}

exercises/zipper/package.json

@@ -31,4 +31,4 @@
   },
   "license": "MIT",
   "dependencies": {}
-}
+}

package.json

@@ -31,4 +31,4 @@
   },
   "license": "MIT",
   "dependencies": {}
-}
+}