Matrix

typescript/matrix/.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/matrix/.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/matrix/.exercism/config.json

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+{
+  "blurb": "Given a string representing a matrix of numbers, return the rows and columns of that matrix.",
+  "authors": ["CRivasGomez"],
+  "contributors": ["masters3d", "SleeplessByte"],
+  "files": {
+    "solution": ["matrix.ts"],
+    "test": ["matrix.test.ts"],
+    "example": [".meta/proof.ci.ts"]
+  },
+  "source": "Warmup to the `saddle-points` warmup.",
+  "source_url": "http://jumpstartlab.com"
+}

typescript/matrix/.exercism/metadata.json

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+{"track":"typescript","exercise":"matrix","id":"9ee65c1e30c049e0b562fa586342093a","url":"https://exercism.org/tracks/typescript/exercises/matrix","handle":"briemens","is_requester":true,"auto_approve":false}

typescript/matrix/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 matrix.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/matrix/README.md

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+# Matrix
+
+Welcome to Matrix on Exercism's TypeScript Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Given a string representing a matrix of numbers, return the rows and columns of
+that matrix.
+
+So given a string with embedded newlines like:
+
+```text
+9 8 7
+5 3 2
+6 6 7
+```
+
+representing this matrix:
+
+```text
+    1  2  3
+  |---------
+1 | 9  8  7
+2 | 5  3  2
+3 | 6  6  7
+```
+
+your code should be able to spit out:
+
+- A list of the rows, reading each row left-to-right while moving
+  top-to-bottom across the rows,
+- A list of the columns, reading each column top-to-bottom while moving
+  from left-to-right.
+
+The rows for our example matrix:
+
+- 9, 8, 7
+- 5, 3, 2
+- 6, 6, 7
+
+And its columns:
+
+- 9, 5, 6
+- 8, 3, 6
+- 7, 2, 7
+
+## Source
+
+### Created by
+
+- @CRivasGomez
+
+### Contributed to by
+
+- @masters3d
+- @SleeplessByte
+
+### Based on
+
+Warmup to the `saddle-points` warmup. - http://jumpstartlab.com

typescript/matrix/babel.config.cjs

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

typescript/matrix/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/matrix/matrix.test.ts

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+import { Matrix } from "./matrix";
+
+describe("Matrix", () => {
+  it("extract row from one number matrix", () => {
+    const expected = [1];
+    expect(new Matrix("1").rows[0]).toEqual(expected);
+  });
+
+  it("can extract row", () => {
+    const expected = [3, 4];
+    expect(new Matrix("1 2\n3 4").rows[1]).toEqual(expected);
+  });
+
+  it("extract row where numbers have different widths", () => {
+    const expected = [10, 20];
+    expect(new Matrix("1 2\n10 20").rows[1]).toEqual(expected);
+  });
+
+  it("can extract row from non-square matrix", () => {
+    const expected = [7, 8, 9];
+    expect(new Matrix("1 2 3\n4 5 6\n7 8 9\n8 7 6").rows[2]).toEqual(expected);
+  });
+
+  it("extract column from one number matrix", () => {
+    const expected = [1];
+    expect(new Matrix("1").columns[0]).toEqual(expected);
+  });
+
+  it("can extract column", () => {
+    const expected = [3, 6, 9];
+    expect(new Matrix("1 2 3\n4 5 6\n7 8 9").columns[2]).toEqual(expected);
+  });
+
+  it("can extract column from non-square matrix", () => {
+    const expected = [3, 6, 9, 6];
+    expect(new Matrix("1 2 3\n4 5 6\n7 8 9\n8 7 6").columns[2]).toEqual(
+      expected
+    );
+  });
+
+  it("extract column where numbers have different widths", () => {
+    const expected = [1903, 3, 4];
+    expect(new Matrix("89 1903 3\n18 3 1\n9 4 800").columns[1]).toEqual(
+      expected
+    );
+  });
+});

typescript/matrix/matrix.ts

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+export class Matrix {
+  private _rows: number[][];
+  private _columns: number[][];
+
+  constructor(matrix: string) {
+    this._rows = matrix
+      .split("\n")
+      .filter(Boolean)
+      .map((row) =>
+        row
+          .split(" ")
+          .filter(Boolean)
+          .map((v) => parseInt(v, 10))
+      );
+
+    this._columns = this.rows[0].map((_, i) => this.rows.map((row) => row[i]));
+  }
+
+  get rows(): number[][] {
+    return this._rows;
+  }
+
+  get columns(): number[][] {
+    return this._columns;
+  }
+}

typescript/matrix/package.json

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+{
+  "name": "@exercism/typescript-matrix",
+  "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/matrix/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"]
+}