Add excercise words and first solution

Author: programmiri

word-count/.eslintrc

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+{
+  "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"
+  }
+}

word-count/README.md

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+# Word Count
+
+Given a phrase, count the occurrences of each word in that phrase.
+
+For example for the input `"olly olly in come free"`
+
+```text
+olly: 2
+in: 1
+come: 1
+free: 1
+```
+
+## 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
+
+This is a classic toy problem, but we were reminded of it by seeing it in the Go Tour.
+
+## Submitting Incomplete Solutions
+
+It's possible to submit an incomplete solution so you can see how others have
+completed the exercise.

word-count/babel.config.js

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

word-count/package.json

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+{
+  "name": "exercism-javascript",
+  "description": "Exercism exercises in Javascript.",
+  "author": "Katrina Owen",
+  "private": true,
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/exercism/javascript"
+  },
+  "devDependencies": {
+    "@babel/cli": "^7.5.5",
+    "@babel/core": "^7.5.5",
+    "@babel/preset-env": "^7.5.5",
+    "@types/jest": "^24.0.16",
+    "@types/node": "^12.6.8",
+    "babel-eslint": "^10.0.2",
+    "babel-jest": "^24.8.0",
+    "eslint": "^6.1.0",
+    "eslint-plugin-import": "^2.18.2",
+    "jest": "^24.8.0"
+  },
+  "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": {}
+}

word-count/word-count.js

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+export class Words {
+  count(string) {
+  	const words = string.toLowerCase().trim().split(/[\s]+/g)
+
+  	return words.reduce((acc, curr) => {
+  		if (acc[curr] && typeof acc[curr] === 'number' ) {
+  			acc[curr] = acc[curr] + 1
+  		} else {
+				acc[curr] = 1
+  		}
+			return acc
+  	}, {})
+  }
+}

word-count/word-count.spec.js

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+import { Words } from './word-count';
+
+describe('words()', () => {
+  const words = new Words();
+
+  test('counts one word', () => {
+    const expectedCounts = { word: 1 };
+    expect(words.count('word')).toEqual(expectedCounts);
+  });
+
+  test('counts one of each', () => {
+    const expectedCounts = { one: 1, of: 1, each: 1 };
+    expect(words.count('one of each')).toEqual(expectedCounts);
+  });
+
+  test('counts multiple occurrences', () => {
+    const expectedCounts = {
+      one: 1, fish: 4, two: 1, red: 1, blue: 1,
+    };
+    expect(words.count('one fish two fish red fish blue fish')).toEqual(expectedCounts);
+  });
+
+  test('includes punctuation', () => {
+    const expectedCounts = {
+      car: 1, ':': 2, carpet: 1, as: 1, java: 1, 'javascript!!&@$%^&': 1,
+    };
+    expect(words.count('car : carpet as java : javascript!!&@$%^&')).toEqual(expectedCounts);
+  });
+
+  test('includes numbers', () => {
+    const expectedCounts = { testing: 2, 1: 1, 2: 1 };
+    expect(words.count('testing 1 2 testing')).toEqual(expectedCounts);
+  });
+
+  test('normalizes to lower case', () => {
+    const expectedCounts = { go: 3 };
+    expect(words.count('go Go GO')).toEqual(expectedCounts);
+  });
+
+  test('counts properly international characters', () => {
+    const expectedCounts = {
+      '¡hola!': 1, '¿qué': 1, 'tal?': 1, 'привет!': 1,
+    };
+    expect(words.count('¡Hola! ¿Qué tal? Привет!')).toEqual(expectedCounts);
+  });
+
+  test('counts multiline', () => {
+    const expectedCounts = { hello: 1, world: 1 };
+    expect(words.count('hello\nworld')).toEqual(expectedCounts);
+  });
+
+  test('counts tabs', () => {
+    const expectedCounts = { hello: 1, world: 1 };
+    expect(words.count('hello\tworld')).toEqual(expectedCounts);
+  });
+
+  test('counts multiple spaces as one', () => {
+    const expectedCounts = { hello: 1, world: 1 };
+    expect(words.count('hello  world')).toEqual(expectedCounts);
+  });
+
+  test('does not count leading or trailing whitespace', () => {
+    const expectedCounts = { introductory: 1, course: 1 };
+    expect(words.count('\t\tIntroductory Course      ')).toEqual(expectedCounts);
+  });
+
+  test('handles properties that exist on Object’s prototype', () => {
+    const expectedCounts = {
+      reserved: 1, words: 1, like: 1, constructor: 1, and: 1, tostring: 1, 'ok?': 1,
+    };
+    expect(words.count('reserved words like constructor and toString ok?')).toEqual(expectedCounts);
+  });
+});