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Commit 624a17d

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author
programmiri
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Add exercise triangle
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‎triangle/.eslintrc‎

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{
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"root": true,
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"parser": "babel-eslint",
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"parserOptions": {
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"ecmaVersion": 7,
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"sourceType": "module"
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},
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"env": {
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"es6": true,
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"node": true,
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"jest": true
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},
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"extends": [
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"eslint:recommended",
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"plugin:import/errors",
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"plugin:import/warnings"
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],
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"rules": {
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"linebreak-style": "off",
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"import/extensions": "off",
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"import/no-default-export": "off",
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"import/no-unresolved": "off",
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"import/prefer-default-export": "off"
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}
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}

‎triangle/README.md‎

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# Triangle
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Determine if a triangle is equilateral, isosceles, or scalene.
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An _equilateral_ triangle has all three sides the same length.
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An _isosceles_ triangle has at least two sides the same length. (It is sometimes
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specified as having exactly two sides the same length, but for the purposes of
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this exercise we'll say at least two.)
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A _scalene_ triangle has all sides of different lengths.
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## Note
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For a shape to be a triangle at all, all sides have to be of length > 0, and
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the sum of the lengths of any two sides must be greater than or equal to the
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length of the third side. See [Triangle Inequality](https://en.wikipedia.org/wiki/Triangle_inequality).
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## Dig Deeper
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The case where the sum of the lengths of two sides _equals_ that of the
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third is known as a _degenerate_ triangle - it has zero area and looks like
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a single line. Feel free to add your own code/tests to check for degenerate triangles.
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## Setup
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Go through the setup instructions for Javascript to install the necessary
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dependencies:
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[https://exercism.io/tracks/javascript/installation](https://exercism.io/tracks/javascript/installation)
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## Requirements
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Install assignment dependencies:
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```bash
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$ npm install
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```
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## Making the test suite pass
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Execute the tests with:
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```bash
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$ npm test
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```
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In the test suites all tests but the first have been skipped.
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Once you get a test passing, you can enable the next one by changing `xtest` to
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`test`.
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## Source
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The Ruby Koans triangle project, parts 1 & 2 [http://rubykoans.com](http://rubykoans.com)
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## Submitting Incomplete Solutions
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It's possible to submit an incomplete solution so you can see how others have
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completed the exercise.

‎triangle/babel.config.js‎

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

‎triangle/package.json‎

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{
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"name": "exercism-javascript",
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"version": "0.0.0",
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"description": "Exercism exercises in Javascript.",
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"author": "Katrina Owen",
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"private": true,
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"repository": {
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"type": "git",
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"url": "https://github.com/exercism/javascript"
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},
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"devDependencies": {
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"@babel/cli": "^7.2.3",
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"@babel/core": "^7.4.0",
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"@babel/preset-env": "^7.4.2",
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"babel-eslint": "^10.0.1",
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"babel-jest": "^24.5.0",
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"eslint": "^5.15.3",
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"eslint-plugin-import": "^2.16.0",
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"jest": "^24.5.0"
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},
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"jest": {
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"modulePathIgnorePatterns": [
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"package.json"
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]
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},
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"scripts": {
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"test": "jest --no-cache ./*",
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"watch": "jest --no-cache --watch ./*",
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"lint": "eslint .",
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"lint-test": "eslint . && jest --no-cache ./* "
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},
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"license": "MIT",
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"dependencies": {}
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}

‎triangle/triangle.spec.js‎

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import { Triangle } from './triangle';
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describe('Triangle', () => {
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test('equilateral triangles have equal sides', () => {
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const triangle = new Triangle(2, 2, 2);
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expect(triangle.kind()).toEqual('equilateral');
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});
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xtest('larger equilateral triangles also have equal sides', () => {
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const triangle = new Triangle(10, 10, 10);
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expect(triangle.kind()).toEqual('equilateral');
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});
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xtest('isosceles triangles have last two sides equal', () => {
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const triangle = new Triangle(3, 4, 4);
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expect(triangle.kind()).toEqual('isosceles');
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});
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xtest('isosceles trianges have first and last sides equal', () => {
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const triangle = new Triangle(4, 3, 4);
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expect(triangle.kind()).toEqual('isosceles');
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});
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xtest('isosceles triangles have two first sides equal', () => {
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const triangle = new Triangle(4, 4, 3);
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expect(triangle.kind()).toEqual('isosceles');
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});
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xtest('isosceles triangles have in fact exactly two sides equal', () => {
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const triangle = new Triangle(10, 10, 2);
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expect(triangle.kind()).toEqual('isosceles');
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});
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xtest('scalene triangles have no equal sides', () => {
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const triangle = new Triangle(3, 4, 5);
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expect(triangle.kind()).toEqual('scalene');
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});
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xtest('scalene triangles have no equal sides at a larger scale too', () => {
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const triangle = new Triangle(10, 11, 12);
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expect(triangle.kind()).toEqual('scalene');
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});
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xtest('scalene triangles have no equal sides in descending order either', () => {
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const triangle = new Triangle(5, 4, 2);
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expect(triangle.kind()).toEqual('scalene');
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});
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xtest('very small triangles are legal', () => {
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const triangle = new Triangle(0.4, 0.6, 0.3);
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expect(triangle.kind()).toEqual('scalene');
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});
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xtest('test triangles with no size are illegal', () => {
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const triangle = new Triangle(0, 0, 0);
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expect(triangle.kind.bind(triangle)).toThrow();
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});
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xtest('triangles with negative sides are illegal', () => {
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const triangle = new Triangle(3, 4, -5);
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expect(triangle.kind.bind(triangle)).toThrow();
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});
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xtest('triangles violating triangle inequality are illegal', () => {
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const triangle = new Triangle(1, 1, 3);
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expect(triangle.kind.bind(triangle)).toThrow();
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});
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xtest('triangles violating triangle inequality are illegal 2', () => {
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const triangle = new Triangle(7, 3, 2);
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expect(triangle.kind.bind(triangle)).toThrow();
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});
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xtest('triangles violating triangle inequality are illegal 3', () => {
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const triangle = new Triangle(10, 1, 3);
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expect(triangle.kind.bind(triangle)).toThrow();
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});
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});

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