Leap

typescript/leap/.eslintignore

@@ -0,0 +1,13 @@
+!.meta
+
+# Protected or generated
+.git
+.vscode
+
+# When using npm
+node_modules/*
+
+# Configuration files
+.eslintrc.cjs
+babel.config.cjs
+jest.config.cjs

typescript/leap/.eslintrc.cjs

@@ -0,0 +1,38 @@
+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/leap/.exercism/config.json

@@ -0,0 +1,12 @@
+{
+  "blurb": "Given a year, report if it is a leap year.",
+  "authors": ["masters3d"],
+  "contributors": ["DFXLuna", "lukaszklis", "SleeplessByte"],
+  "files": {
+    "solution": ["leap.ts"],
+    "test": ["leap.test.ts"],
+    "example": [".meta/proof.ci.ts"]
+  },
+  "source": "JavaRanch Cattle Drive, exercise 3",
+  "source_url": "http://www.javaranch.com/leap.jsp"
+}

typescript/leap/.exercism/metadata.json

@@ -0,0 +1 @@
+{"track":"typescript","exercise":"leap","id":"c96f222f67bc489ca089592e9d75ce11","url":"https://exercism.org/tracks/typescript/exercises/leap","handle":"briemens","is_requester":true,"auto_approve":false}

typescript/leap/HELP.md

@@ -0,0 +1,44 @@
+# 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 leap.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/leap/README.md

@@ -0,0 +1,45 @@
+# Leap
+
+Welcome to Leap on Exercism's TypeScript Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Given a year, report if it is a leap year.
+
+The tricky thing here is that a leap year in the Gregorian calendar occurs:
+
+```text
+on every year that is evenly divisible by 4
+  except every year that is evenly divisible by 100
+    unless the year is also evenly divisible by 400
+```
+
+For example, 1997 is not a leap year, but 1996 is. 1900 is not a leap
+year, but 2000 is.
+
+## Notes
+
+Though our exercise adopts some very simple rules, there is more to
+learn!
+
+For a delightful, four minute explanation of the whole leap year
+phenomenon, go watch [this youtube video][video].
+
+[video]: http://www.youtube.com/watch?v=xX96xng7sAE
+
+## Source
+
+### Created by
+
+- @masters3d
+
+### Contributed to by
+
+- @DFXLuna
+- @lukaszklis
+- @SleeplessByte
+
+### Based on
+
+JavaRanch Cattle Drive, exercise 3 - http://www.javaranch.com/leap.jsp

typescript/leap/babel.config.cjs

@@ -0,0 +1,4 @@
+module.exports = {
+  presets: ['@exercism/babel-preset-typescript'],
+  plugins: [],
+}

typescript/leap/jest.config.cjs

@@ -0,0 +1,19 @@
+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/leap/leap.test.ts

@@ -0,0 +1,39 @@
+import { isLeap } from "./leap";
+
+describe("A leap year", () => {
+  it("year not divisible by 4 in common year", () => {
+    expect(isLeap(2015)).toBe(false);
+  });
+
+  it("year divisible by 2, not divisible by 4 in common year", () => {
+    expect(isLeap(1970)).toBe(false);
+  });
+
+  it("year divisible by 4, not divisible by 100 in leap year", () => {
+    expect(isLeap(1996)).toBe(true);
+  });
+
+  it("year divisible by 4 and 5 is still a leap year", () => {
+    expect(isLeap(1960)).toBe(true);
+  });
+
+  it("year divisible by 100, not divisible by 400 in common year", () => {
+    expect(isLeap(2100)).toBe(false);
+  });
+
+  it("year divisible by 100 but not by 3 is still not a leap year", () => {
+    expect(isLeap(1900)).toBe(false);
+  });
+
+  it("year divisible by 400 in leap year", () => {
+    expect(isLeap(2000)).toBe(true);
+  });
+
+  it("year divisible by 400 but not by 125 is still a leap year", () => {
+    expect(isLeap(2400)).toBe(true);
+  });
+
+  it("year divisible by 200, not divisible by 400 in common year", () => {
+    expect(isLeap(1800)).toBe(false);
+  });
+});

typescript/leap/leap.ts

@@ -0,0 +1,6 @@
+export function isLeap(year: number): boolean {
+  if (year % 400 === 0) return true;
+  if (year % 100 === 0) return false;
+  if (year % 4 === 0) return true;
+  return false;
+}

typescript/leap/package.json

@@ -0,0 +1,31 @@
+{
+  "name": "@exercism/typescript-leap",
+  "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/leap/tsconfig.json

@@ -0,0 +1,28 @@
+{
+  "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"]
+}