Secret handshake

typescript/secret-handshake/.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/secret-handshake/.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',
+      rules: {
+        "@typescript-eslint/semi": 0,
+      },
+    },
+  ],
+}

typescript/secret-handshake/.exercism/config.json

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+{
+  "blurb": "Given a decimal number, convert it to the appropriate sequence of events for a secret handshake.",
+  "authors": ["CRivasGomez"],
+  "contributors": ["masters3d", "SleeplessByte"],
+  "files": {
+    "solution": ["secret-handshake.ts"],
+    "test": ["secret-handshake.test.ts"],
+    "example": [".meta/proof.ci.ts"]
+  },
+  "source": "Bert, in Mary Poppins",
+  "source_url": "http://www.imdb.com/title/tt0058331/quotes/qt0437047"
+}

typescript/secret-handshake/.exercism/metadata.json

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+{"track":"typescript","exercise":"secret-handshake","id":"d699480d1ea844e484c6c9527851b3b7","url":"https://exercism.org/tracks/typescript/exercises/secret-handshake","handle":"briemens","is_requester":true,"auto_approve":false}

typescript/secret-handshake/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 secret-handshake.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/secret-handshake/README.md

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+# Secret Handshake
+
+Welcome to Secret Handshake on Exercism's TypeScript Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+> There are 10 types of people in the world: Those who understand
+> binary, and those who don't.
+
+You and your fellow cohort of those in the "know" when it comes to
+binary decide to come up with a secret "handshake".
+
+```text
+1 = wink
+10 = double blink
+100 = close your eyes
+1000 = jump
+
+
+10000 = Reverse the order of the operations in the secret handshake.
+```
+
+Given a decimal number, convert it to the appropriate sequence of events for a secret handshake.
+
+Here's a couple of examples:
+
+Given the input 3, the function would return the array
+["wink", "double blink"] because 3 is 11 in binary.
+
+Given the input 19, the function would return the array
+["double blink", "wink"] because 19 is 10011 in binary.
+Notice that the addition of 16 (10000 in binary)
+has caused the array to be reversed.
+
+## Source
+
+### Created by
+
+- @CRivasGomez
+
+### Contributed to by
+
+- @masters3d
+- @SleeplessByte
+
+### Based on
+
+Bert, in Mary Poppins - http://www.imdb.com/title/tt0058331/quotes/qt0437047

typescript/secret-handshake/babel.config.cjs

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

typescript/secret-handshake/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/secret-handshake/package.json

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+{
+  "name": "@exercism/typescript-secret-handshake",
+  "version": "1.0.0",
+  "description": "Exercism exercises in Typescript.",
+  "private": true,
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/exercism/typescript"
+  },
+  "type": "module",
+  "engines": {
+    "node": "^14.13.1 || >=16.0.0"
+  },
+  "devDependencies": {
+    "@exercism/babel-preset-typescript": "^0.1.0",
+    "@exercism/eslint-config-typescript": "^0.4.1",
+    "@types/jest": "^27.4.0",
+    "@types/node": "^16.11.24",
+    "babel-jest": "^27.5.1",
+    "core-js": "^3.21.0",
+    "eslint": "^8.9.0",
+    "jest": "^27.5.1",
+    "typescript": "^4.5.4"
+  },
+  "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"
+  }
+}

typescript/secret-handshake/secret-handshake.test.ts

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+import { commands } from "./secret-handshake";
+
+describe("Secret Handshake", () => {
+  describe("Create A Handshake For A Number", () => {
+    it("wink for 1", () => {
+      expect(commands(1)).toEqual(["wink"]);
+    });
+
+    it("double blink for 10", () => {
+      expect(commands(2)).toEqual(["double blink"]);
+    });
+
+    it("close your eyes for 100", () => {
+      expect(commands(4)).toEqual(["close your eyes"]);
+    });
+
+    it("jump for 1000", () => {
+      expect(commands(8)).toEqual(["jump"]);
+    });
+
+    it("combine two actions", () => {
+      expect(commands(3)).toEqual(["wink", "double blink"]);
+    });
+
+    it("reverse two actions", () => {
+      expect(commands(19)).toEqual(["double blink", "wink"]);
+    });
+
+    it("reversing one action gives the same action", () => {
+      expect(commands(24)).toEqual(["jump"]);
+    });
+
+    it("reversing no actions still gives no actions", () => {
+      expect(commands(16)).toEqual([]);
+    });
+
+    it("all possible actions", () => {
+      expect(commands(15)).toEqual([
+        "wink",
+        "double blink",
+        "close your eyes",
+        "jump",
+      ]);
+    });
+
+    it("reverse all possible actions", () => {
+      expect(commands(31)).toEqual([
+        "jump",
+        "close your eyes",
+        "double blink",
+        "wink",
+      ]);
+    });
+
+    it("do nothing for zero", () => {
+      expect(commands(0 as 1)).toEqual([]);
+    });
+  });
+});

typescript/secret-handshake/secret-handshake.ts

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+const responses = ["wink", "double blink", "close your eyes", "jump"] as const;
+
+export function commands(secret: Secret): Response[] {
+  if (secret < 1 || secret > 31) {
+    return [];
+  }
+
+  const result = secret
+    .toString(2)
+    .split("")
+    .reverse()
+    .map((s, i) => (s === "1" ? responses[i] : null))
+    .filter(Boolean);
+
+  if (secret >= 16) {
+    return result.reverse() as Response[];
+  }
+  return result as Response[];
+}
+
+type Secret =
+  | 1
+  | 2
+  | 3
+  | 4
+  | 5
+  | 6
+  | 7
+  | 8
+  | 9
+  | 10
+  | 11
+  | 12
+  | 13
+  | 14
+  | 15
+  | 16
+  | 17
+  | 18
+  | 19
+  | 20
+  | 21
+  | 22
+  | 23
+  | 24
+  | 25
+  | 26
+  | 27
+  | 28
+  | 29
+  | 30
+  | 31;
+
+type Response = typeof responses[number];

typescript/secret-handshake/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"]
+}