Add code

data-tables/babel.config.js

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+module.exports = {
+  presets: [
+    [ '@babel/env', {
+      useBuiltIns: 'usage'
+    }]
+  ]
+}

data-tables/features/json.feature

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+Feature:
+	As the owner of a book collection
+	I want to be able to generate JSON containing titles from this collection
+
+	Scenario:
+		Given the following books by Simon Frank are in the collection:
+			| id | title                      |
+			| 1  | Der Gegenstand des Wissens |
+			| 2  | Lebendiges Wissen          |
+		When I stringify it
+		Then I should get:
+			"""
+			[{
+			  "id": 1,
+			  "title": "Der Gegenstand des Wissens"
+			},{
+			  "id": 2,
+			  "title": "Lebendiges Wissen"
+			}]
+			"""
+
+		Given the following books by Søren Kierkegaard are in the collection:
+			| id | title                  |
+			| 1  | Die Krankheit zum Tode |
+			| 2  | Entweder-Oder          |
+		When I stringify it
+		Then I should get:
+			"""
+			[{
+			  "id": 1,
+			  "title": "Die Krankheit zum Tode"
+			},{
+			  "id": 2,
+			  "title": "Entweder-Oder"
+			}]
+			"""
+
+		Given the following book is in the collection:
+			| id     | 1               |
+			| title  | Leonce und Lena |
+			| author | Georg Büchner   |
+		When I stringify it
+		Then I should get:
+			"""
+			{
+			  "id": 1,
+			  "title": "Leonce und Lena",
+			  "author": "Georg Büchner"
+			}
+			"""
+
+		Given the following books are in the collection:
+			| Friedrich Nietzsche | Die Geburt der Tragödie    |
+			| Jacques Derrida     | Die unbedingte Universität |
+			| Honoré de Balzac    | Die Frau von 30 Jahren     |
+		When I stringify it
+		Then I should get:
+			"""
+			[{
+			  "author": "Friedrich Nietzsche",
+			  "title": "Die Geburt der Tragödie"
+			},{
+			  "author": "Jacques Derrida",
+			  "title": "Die unbedingte Universität"
+			},{
+			  "author": "Honoré de Balzac",
+			  "title": "Die Frau von 30 Jahren"
+			}]
+			"""

data-tables/features/steps/json.js

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+import { Given, When, Then } from 'cucumber'
+import { expect } from 'chai'
+
+Given('the following books by Simon Frank are in the collection:', function (dataTable) {
+  this.objects = []
+  dataTable.hashes().forEach(el => {
+    this.objects.push({
+      id: parseInt(el.id),
+      title: el.title
+    })
+  })
+})
+
+Given('the following books by Søren Kierkegaard are in the collection:', function (dataTable) {
+  this.objects = []
+  dataTable.rows().forEach(el => {
+    this.objects.push({
+      id: parseInt(el[0]),
+      title: el[1]
+    })
+  })
+})
+
+Given('the following book is in the collection:', function (dataTable) {
+  const data = dataTable.rowsHash()
+  this.objects = {
+    id: parseInt(data.id),
+    title: data.title,
+    author: data.author
+  }
+})
+
+Given('the following books are in the collection:', function (dataTable) {
+  this.objects = []
+  dataTable.raw().forEach(el => {
+    this.objects.push({
+      author: el[0],
+      title: el[1]
+    })
+  })
+})
+
+When('I stringify it', function () {
+  this.result = JSON.stringify(this.objects)
+})
+
+Then('I should get:', function (expected) {
+  expect(JSON.parse(expected))
+    .to.deep.equal(JSON.parse(this.result))
+})

data-tables/package.json

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+{
+  "name": "data-tables",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "cucumber-js --require-module '@babel/register'"
+  },
+  "author": "Eugen Wissner <belka@caraus.de>",
+  "license": "MPL-2.0",
+  "dependencies": {
+    "@babel/core": "^7.1.5",
+    "@babel/preset-env": "^7.1.5",
+    "@babel/register": "^7.0.0",
+    "babel-loader": "^8.0.4",
+    "chai": "^4.2.0",
+    "cucumber": "^5.0.2"
+  }
+}