Word count

typescript/word-count/.eslintignore

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+!.meta
+
+# Protected or generated
+.git
+.vscode
+
+# When using npm
+node_modules/*
+
+# Configuration files
+.eslintrc.cjs
+babel.config.cjs
+jest.config.cjs

typescript/word-count/.eslintrc.cjs

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+module.exports = {
+  root: true,
+  parserOptions: {
+    tsconfigRootDir: __dirname,
+    project: ['./tsconfig.json'],
+  },
+  overrides: [
+    // Student provided files
+    {
+      files: ['*.ts'],
+      excludedFiles: ['.meta/proof.ci.ts', '.meta/exemplar.ts', '*.test.ts'],
+      extends: '@exercism/eslint-config-typescript',
+    },
+    // Exercism given tests
+    {
+      files: ['*.test.ts'],
+      excludedFiles: ['custom.test.ts'],
+      env: {
+        jest: true,
+      },
+      extends: '@exercism/eslint-config-typescript/maintainers',
+    },
+    // Student provided tests
+    {
+      files: ['custom.test.ts'],
+      env: {
+        jest: true,
+      },
+      extends: '@exercism/eslint-config-typescript',
+    },
+    // Exercism provided files
+    {
+      files: ['.meta/proof.ci.ts', '.meta/exemplar.ts', '*.test.ts'],
+      excludedFiles: ['custom.test.ts'],
+      extends: '@exercism/eslint-config-typescript/maintainers',
+    },
+  ],
+}

typescript/word-count/.exercism/config.json

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+{
+  "authors": [
+    "masters3d"
+  ],
+  "contributors": [
+    "lukaszklis",
+    "SleeplessByte",
+    "angelikatyborska"
+  ],
+  "files": {
+    "solution": [
+      "word-count.ts"
+    ],
+    "test": [
+      "word-count.test.ts"
+    ],
+    "example": [
+      ".meta/proof.ci.ts"
+    ]
+  },
+  "blurb": "Given a phrase, count the occurrences of each word in that phrase.",
+  "source": "This is a classic toy problem, but we were reminded of it by seeing it in the Go Tour."
+}

typescript/word-count/.exercism/metadata.json

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+{"track":"typescript","exercise":"word-count","id":"cce122a248e44dd89a7b6f6048ff1353","url":"https://exercism.org/tracks/typescript/exercises/word-count","handle":"briemens","is_requester":true,"auto_approve":false}

typescript/word-count/.yarnrc.yml

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+yarnPath: .yarn/releases/yarn-3.6.0.cjs

typescript/word-count/HELP.md

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+# Help
+
+## Running the tests
+
+Execute the tests with:
+
+```bash
+$ yarn test
+```
+
+## Skipped tests
+
+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 `xit` to
+`it`.
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit word-count.ts` command.
+This command will upload your solution to the Exercism website and print the solution page's URL.
+
+It's possible to submit an incomplete solution which allows you to:
+
+- See how others have completed the exercise
+- Request help from a mentor
+
+## Need to get help?
+
+If you'd like help solving the exercise, check the following pages:
+
+- The [TypeScript track's documentation](https://exercism.org/docs/tracks/typescript)
+- [Exercism's programming category on the forum](https://forum.exercism.org/c/programming/5)
+- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
+
+Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
+
+To get help if you're having trouble, you can use one of the following resources:
+
+- [TypeScript QuickStart](https://www.typescriptlang.org/docs/handbook/release-notes/overview.html)
+- [ECMAScript 2015 Language Specification](https://www.ecma-international.org/wp-content/uploads/ECMA-262_6th_edition_june_2015.pdf) (pdf)
+- [Mozilla JavaScript Reference](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference)
+- [/r/typescript](https://www.reddit.com/r/typescript) is the TypeScript subreddit.
+- [StackOverflow](https://stackoverflow.com/questions/tagged/typescript) can be used to search for your problem and see if it has been answered already. You can also ask and answer questions.

typescript/word-count/README.md

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+# Word Count
+
+Welcome to Word Count on Exercism's TypeScript Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Introduction
+
+You teach English as a foreign language to high school students.
+
+You've decided to base your entire curriculum on TV shows.
+You need to analyze which words are used, and how often they're repeated.
+
+This will let you choose the simplest shows to start with, and to gradually increase the difficulty as time passes.
+
+## Instructions
+
+Your task is to count how many times each word occurs in a subtitle of a drama.
+
+The subtitles from these dramas use only ASCII characters.
+
+The characters often speak in casual English, using contractions like _they're_ or _it's_.
+Though these contractions come from two words (e.g. _we are_), the contraction (_we're_) is considered a single word.
+
+Words can be separated by any form of punctuation (e.g. ":", "!", or "?") or whitespace (e.g. "\t", "\n", or " ").
+The only punctuation that does not separate words is the apostrophe in contractions.
+
+Numbers are considered words.
+If the subtitles say _It costs 100 dollars._ then _100_ will be its own word.
+
+Words are case insensitive.
+For example, the word _you_ occurs three times in the following sentence:
+
+> You come back, you hear me? DO YOU HEAR ME?
+
+The ordering of the word counts in the results doesn't matter.
+
+Here's an example that incorporates several of the elements discussed above:
+
+- simple words
+- contractions
+- numbers
+- case insensitive words
+- punctuation (including apostrophes) to separate words
+- different forms of whitespace to separate words
+
+`"That's the password: 'PASSWORD 123'!", cried the Special Agent.\nSo I fled.`
+
+The mapping for this subtitle would be:
+
+```text
+123: 1
+agent: 1
+cried: 1
+fled: 1
+i: 1
+password: 2
+so: 1
+special: 1
+that's: 1
+the: 2
+```
+
+## Source
+
+### Created by
+
+- @masters3d
+
+### Contributed to by
+
+- @lukaszklis
+- @SleeplessByte
+- @angelikatyborska
+
+### Based on
+
+This is a classic toy problem, but we were reminded of it by seeing it in the Go Tour.

typescript/word-count/babel.config.cjs

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+module.exports = {
+  presets: ['@exercism/babel-preset-typescript'],
+  plugins: [],
+}

typescript/word-count/jest.config.cjs

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+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$',
+    '<rootDir>/test/fixtures',
+    '<rootDir>/test/helpers',
+    '__mocks__',
+  ],
+  transform: {
+    '^.+\\.[jt]sx?$': 'babel-jest',
+  },
+}

typescript/word-count/package.json

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+{
+  "name": "@exercism/typescript-word-count",
+  "version": "1.0.0",
+  "description": "Exercism exercises in Typescript.",
+  "private": true,
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/exercism/typescript"
+  },
+  "type": "module",
+  "engines": {
+    "node": "^18.16.0 || >=20.0.0"
+  },
+  "devDependencies": {
+    "@exercism/babel-preset-typescript": "^0.4.0",
+    "@exercism/eslint-config-typescript": "^0.5.0",
+    "@types/jest": "^29.5.2",
+    "@types/node": "~18.16.16",
+    "babel-jest": "^29.5.0",
+    "core-js": "~3.30.2",
+    "eslint": "^8.42.0",
+    "jest": "^29.5.0",
+    "typescript": "~5.0.4"
+  },
+  "scripts": {
+    "test": "yarn lint:types && jest --no-cache",
+    "lint": "yarn lint:types && yarn lint:ci",
+    "lint:types": "yarn tsc --noEmit -p .",
+    "lint:ci": "eslint . --ext .tsx,.ts"
+  },
+  "packageManager": "yarn@3.6.0"
+}

typescript/word-count/tsconfig.json

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+{
+  "display": "Configuration for Exercism TypeScript Exercises",
+  "compilerOptions": {
+    // Allows you to use the newest syntax, and have access to console.log
+    // https://www.typescriptlang.org/tsconfig#lib
+    "lib": ["ESNEXT", "dom"],
+    // Make sure typescript is configured to output ESM
+    // https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c#how-can-i-make-my-typescript-project-output-esm
+    "module": "ES2020",
+    // Since this project is using babel, TypeScript may target something very
+    // high, and babel will make sure it runs on your local Node version.
+    // https://babeljs.io/docs/en/
+    "target": "ESNext", // ESLint doesn't support this yet: "es2022",
+
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+
+    // Because we'll be using babel: ensure that Babel can safely transpile
+    // files in the TypeScript project.
+    //
+    // https://babeljs.io/docs/en/babel-plugin-transform-typescript/#caveats
+    "isolatedModules": true
+  },
+  "include": ["*.ts", "*.tsx", ".meta/*.ts", ".meta/*.tsx"],
+  "exclude": ["node_modules"]
+}

typescript/word-count/word-count.test.ts

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+import { count } from './word-count'
+
+describe('count()', () => {
+  it('counts one word', () => {
+    const expectedCounts = new Map(Object.entries({ word: 1 }))
+    expect(count('word')).toEqual(expectedCounts)
+  })
+
+  it('counts one of each', () => {
+    const expectedCounts = new Map(Object.entries({ one: 1, of: 1, each: 1 }))
+    expect(count('one of each')).toEqual(expectedCounts)
+  })
+
+  it('counts multiple occurrences', () => {
+    const expectedCounts = new Map(
+      Object.entries({ one: 1, fish: 4, two: 1, red: 1, blue: 1 })
+    )
+    expect(count('one fish two fish red fish blue fish')).toEqual(
+      expectedCounts
+    )
+  })
+
+  it('handles cramped lists', () => {
+    const expectedCounts = new Map(Object.entries({ one: 1, two: 1, three: 1 }))
+    expect(count('one,two,three')).toEqual(expectedCounts)
+  })
+
+  it('handles expanded lists', () => {
+    const expectedCounts = new Map(Object.entries({ one: 1, two: 1, three: 1 }))
+    expect(count('one,\ntwo,\nthree')).toEqual(expectedCounts)
+  })
+
+  it('ignores punctuation', () => {
+    const expectedCounts = new Map(
+      Object.entries({
+        car: 1,
+        carpet: 1,
+        as: 1,
+        java: 1,
+        javascript: 1,
+      })
+    )
+    expect(count('car: carpet as java: javascript!!&@$%^&"')).toEqual(
+      expectedCounts
+    )
+  })
+
+  it('includes numbers', () => {
+    const expectedCounts = new Map(Object.entries({ testing: 2, 1: 1, 2: 1 }))
+    expect(count('testing, 1, 2 testing')).toEqual(expectedCounts)
+  })
+
+  it('normalizes case', () => {
+    const expectedCounts = new Map(Object.entries({ go: 3, stop: 2 }))
+    expect(count('go Go GO Stop stop')).toEqual(expectedCounts)
+  })
+
+  it('with apostrophes', () => {
+    const expectedCounts = new Map(
+      Object.entries({
+        first: 1,
+        "don't": 2,
+        laugh: 1,
+        then: 1,
+        cry: 1,
+        "you're": 1,
+        getting: 1,
+        it: 1,
+      })
+    )
+    expect(
+      count("'First: don't laugh. Then: don't cry. You're getting it.'")
+    ).toEqual(expectedCounts)
+  })
+
+  it('substrings from the beginning', () => {
+    const expectedCounts = new Map(
+      Object.entries({
+        joe: 1,
+        "can't": 1,
+        tell: 1,
+        between: 1,
+        app: 1,
+        apple: 1,
+        and: 1,
+        a: 1,
+      })
+    )
+    expect(count("Joe can't tell between app, apple and a.")).toEqual(
+      expectedCounts
+    )
+  })
+
+  it('multiple spaces not detected as a word', () => {
+    const expectedCounts = new Map(
+      Object.entries({ multiple: 1, whitespaces: 1 })
+    )
+    expect(count(' multiple   whitespaces')).toEqual(expectedCounts)
+  })
+
+  it('alternating word separators not detected as a word', () => {
+    const expectedCounts = new Map(Object.entries({ one: 1, two: 1, three: 1 }))
+    expect(count(",\n,one,\n ,two \n 'three'")).toEqual(expectedCounts)
+  })
+
+  it('quotation for word with apostrophe', () => {
+    const expectedCounts = new Map(Object.entries({ can: 1, "can't": 2 }))
+    expect(count("can, can't, 'can't'")).toEqual(expectedCounts)
+  })
+
+  it('handles properties that exist on Object’s prototype', () => {
+    const expectedCounts = new Map(
+      Object.entries({
+        reserved: 1,
+        words: 1,
+        like: 1,
+        constructor: 1,
+        and: 1,
+        tostring: 1,
+        ok: 1,
+      })
+    )
+    expect(count('reserved words like constructor and toString ok?')).toEqual(
+      expectedCounts
+    )
+  })
+})

typescript/word-count/word-count.ts

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+export const count = (sentence: string): Map<string, number> => 
+  sentence
+    .toLowerCase()
+    .trim()
+    .replace(/^'(.*?)'$/, '$1')
+    .split(/[^a-zA-Z0-9']/)
+    .map(value => value.trim().replace(/^'(.*?)'$/, '$1'))
+    .filter(Boolean)
+    .reduce(
+      (acc, word) => acc.set(word, (acc.get(word) || 0) + 1),
+      new Map<string, number>()
+    );