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Commit eca0d75

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programmiri
committed
Add exercise ETL with solution for it
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‎etl/.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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}

‎etl/README.md‎

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# ETL
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We are going to do the `Transform` step of an Extract-Transform-Load.
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### ETL
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Extract-Transform-Load (ETL) is a fancy way of saying, "We have some crufty, legacy data over in this system, and now we need it in this shiny new system over here, so
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we're going to migrate this."
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(Typically, this is followed by, "We're only going to need to run this
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once." That's then typically followed by much forehead slapping and
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moaning about how stupid we could possibly be.)
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### The goal
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We're going to extract some scrabble scores from a legacy system.
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The old system stored a list of letters per score:
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- 1 point: "A", "E", "I", "O", "U", "L", "N", "R", "S", "T",
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- 2 points: "D", "G",
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- 3 points: "B", "C", "M", "P",
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- 4 points: "F", "H", "V", "W", "Y",
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- 5 points: "K",
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- 8 points: "J", "X",
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- 10 points: "Q", "Z",
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The shiny new scrabble system instead stores the score per letter, which
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makes it much faster and easier to calculate the score for a word. It
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also stores the letters in lower-case regardless of the case of the
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input letters:
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- "a" is worth 1 point.
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- "b" is worth 3 points.
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- "c" is worth 3 points.
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- "d" is worth 2 points.
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- Etc.
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Your mission, should you choose to accept it, is to transform the legacy data
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format to the shiny new format.
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### Notes
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A final note about scoring, Scrabble is played around the world in a
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variety of languages, each with its own unique scoring table. For
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example, an "E" is scored at 2 in the Māori-language version of the
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game while being scored at 4 in the Hawaiian-language version.
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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 Jumpstart Lab team [http://jumpstartlab.com](http://jumpstartlab.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.

‎etl/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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};

‎etl/etl.js‎

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export const transform = (oldMap) => {
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return Object.keys(oldMap).reduce((acc, curr) => {
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oldMap[curr].forEach((letter) => {
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acc[letter.toLowerCase()] = Number(curr);
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});
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return acc;
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}, {});
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};

‎etl/etl.spec.js‎

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import { transform } from './etl';
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describe('Transform', () => {
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test('transforms one value', () => {
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const old = { 1: ['A'] };
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const expected = { a: 1 };
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expect(transform(old)).toEqual(expected);
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});
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test('transforms more values', () => {
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const old = { 1: ['A', 'E', 'I', 'O', 'U'] };
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const expected = {
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a: 1,
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e: 1,
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i: 1,
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o: 1,
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u: 1,
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};
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expect(transform(old)).toEqual(expected);
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});
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test('transforms more keys', () => {
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const old = { 1: ['A', 'E'], 2: ['D', 'G'] };
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const expected = {
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a: 1,
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e: 1,
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d: 2,
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g: 2,
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};
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expect(transform(old)).toEqual(expected);
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});
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test('transforms a full dataset', () => {
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const old = {
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1: ['A', 'E', 'I', 'O', 'U', 'L', 'N', 'R', 'S', 'T'],
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2: ['D', 'G'],
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3: ['B', 'C', 'M', 'P'],
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4: ['F', 'H', 'V', 'W', 'Y'],
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5: ['K'],
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8: ['J', 'X'],
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10: ['Q', 'Z'],
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};
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const expected = {
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a: 1,
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b: 3,
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c: 3,
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d: 2,
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e: 1,
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f: 4,
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g: 2,
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h: 4,
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i: 1,
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j: 8,
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k: 5,
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l: 1,
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m: 3,
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n: 1,
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o: 1,
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p: 3,
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q: 10,
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r: 1,
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s: 1,
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t: 1,
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u: 1,
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v: 4,
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w: 4,
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x: 8,
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y: 4,
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z: 10,
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};
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expect(transform(old)).toEqual(expected);
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});
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});

‎etl/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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