Add excercise Matrix

Author: programmiri

matrix/.eslintrc

@@ -0,0 +1,26 @@
+{
+  "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"
+  }
+}

matrix/README.md

@@ -0,0 +1,78 @@
+# Matrix
+
+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
+
+## 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
+
+Warmup to the `saddle-points` warmup. [http://jumpstartlab.com](http://jumpstartlab.com)
+
+## Submitting Incomplete Solutions
+
+It's possible to submit an incomplete solution so you can see how others have
+completed the exercise.

matrix/babel.config.js

@@ -0,0 +1,14 @@
+module.exports = {
+  presets: [
+    [
+      '@babel/env',
+      {
+        targets: {
+          node: 'current',
+        },
+        useBuiltIns: false,
+      },
+
+    ],
+  ],
+};

matrix/matrix.js

@@ -0,0 +1,18 @@
+//
+// This is only a SKELETON file for the 'Matrix' exercise. It's been provided as a
+// convenience to get you started writing code faster.
+//
+
+export class Matrix {
+  constructor() {
+    throw new Error("Remove this statement and implement this function");
+  }
+
+  get rows() {
+    throw new Error("Remove this statement and implement this function");
+  }
+
+  get columns() {
+    throw new Error("Remove this statement and implement this function");
+  }
+}

matrix/matrix.spec.js

@@ -0,0 +1,39 @@
+import { Matrix } from './matrix';
+
+describe('Matrix', () => {
+  test('extract row from one number matrix', () => {
+    expect(new Matrix('1').rows[0]).toEqual([1]);
+  });
+
+  xtest('can extract row', () => {
+    expect(new Matrix('1 2\n3 4').rows[1]).toEqual([3, 4]);
+  });
+
+  xtest('extract row where numbers have different widths', () => {
+    expect(new Matrix('1 2\n10 20').rows[1]).toEqual([10, 20]);
+  });
+
+  xtest('can extract row from non-square matrix with no corresponding column', () => {
+    expect(new Matrix('1 2 3\n4 5 6\n7 8 9\n8 7 6').rows[3]).toEqual([8, 7, 6]);
+  });
+
+  xtest('extract column from one number matrix', () => {
+    expect(new Matrix('1').columns[0]).toEqual([1]);
+  });
+
+  xtest('can extract column', () => {
+    expect(new Matrix('1 2 3\n4 5 6\n7 8 9').columns[2]).toEqual([3, 6, 9]);
+  });
+
+  xtest('can extract column from non-square matrix with no corresponding row', () => {
+    expect(new Matrix('1 2 3 4\n5 6 7 8\n9 8 7 6').columns[3]).toEqual([4, 8, 6]);
+  });
+
+  xtest('can extract column from non-square matrix with more columns than rows', () => {
+    expect(new Matrix('1 2 3\n4 5 6').columns[2]).toEqual([3, 6]);
+  });
+
+  xtest('extract column where numbers have different widths', () => {
+    expect(new Matrix('89 1903 3\n18 3 1\n9 4 800').columns[1]).toEqual([1903, 3, 4]);
+  });
+});

matrix/package.json

@@ -0,0 +1,35 @@
+{
+  "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": {}
+}