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Commit 9d65120

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author
programmiri
committed
Add excercise and first solution
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‎difference-of-squares/.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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}

‎difference-of-squares/README.md‎

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# Difference Of Squares
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Find the difference between the square of the sum and the sum of the squares of the first N natural numbers.
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The square of the sum of the first ten natural numbers is
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(1 + 2 + ... + 10)2 = 552 = 3025.
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The sum of the squares of the first ten natural numbers is
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12 + 22 + ... + 102 = 385.
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Hence the difference between the square of the sum of the first
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ten natural numbers and the sum of the squares of the first ten
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natural numbers is 3025 -ひく 385 =わ 2640.
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You are not expected to discover an efficient solution to this yourself from
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first principles; research is allowed, indeed, encouraged. Finding the best
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algorithm for the problem is a key skill in software engineering.
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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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Problem 6 at Project Euler [http://projecteuler.net/problem=6](http://projecteuler.net/problem=6)
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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.
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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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};
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export class Squares {
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constructor(number) {
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this.number = number;
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}
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get sumOfSquares() {
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let count = 0;
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for (let i = 1; i <= this.number; i++ ) {
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count += i * i
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}
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return count;
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}
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get squareOfSum() {
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let count = 0;
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for (let i = 1; i <= this.number; i++ ) {
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count += i
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}
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return count * count;
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}
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get difference() {
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return this.squareOfSum - this.sumOfSquares
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}
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}
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import { Squares } from './difference-of-squares';
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describe('difference-of-squares', () => {
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const squares1 = new Squares(1);
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const squares5 = new Squares(5);
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const squares100 = new Squares(100);
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describe('Square the sum of the numbers up to the given number', () => {
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test('square of sum 1', () => {
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expect(squares1.squareOfSum).toBe(1);
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});
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test('square of sum 5', () => {
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expect(squares5.squareOfSum).toBe(225);
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});
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test('square of sum 100', () => {
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expect(squares100.squareOfSum).toBe(25502500);
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});
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});
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describe('Sum the squares of the numbers up to the given number', () => {
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test('sum of squares 1', () => {
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expect(squares1.sumOfSquares).toBe(1);
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});
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test('sum of squares 5', () => {
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expect(squares5.sumOfSquares).toBe(55);
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});
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test('sum of squares 100', () => {
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expect(squares100.sumOfSquares).toBe(338350);
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});
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});
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describe('Subtract sum of squares from square of sums', () => {
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test('difference of squares 1', () => {
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expect(squares1.difference).toBe(0);
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});
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test('difference of squares 5', () => {
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expect(squares5.difference).toBe(170);
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});
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test('difference of squares 100', () => {
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expect(squares100.difference).toBe(25164150);
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});
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});
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});

‎difference-of-squares/package.json‎

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{
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"name": "exercism-javascript",
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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": "^7.5.5",
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"@babel/core": "^7.5.5",
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"@babel/preset-env": "^7.5.5",
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"@types/jest": "^24.0.16",
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"@types/node": "^12.6.8",
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"babel-eslint": "^10.0.2",
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"babel-jest": "^24.8.0",
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"eslint": "^6.1.0",
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"eslint-plugin-import": "^2.18.2",
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"jest": "^24.8.0"
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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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}

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