initial import

javascript/.gitignore

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+/node_modules/
+package-lock.json

javascript/package.json

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+{
+  "name": "theatrical-players-refactoring-kata",
+  "jest": {
+    "verbose": true
+  },
+  "version": "1.0.0",
+  "description": "Example from first chapter of 'Refactoring' by Martin Fowler, 2nd Edition (https://www.thoughtworks.com/books/refactoring2)",
+  "scripts": {
+    "test": "jest"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/emilybache/Theatrical-Players-Refactoring-Kata.git"
+  },
+  "keywords": [
+    "kata",
+    "refactor"
+  ],
+  "license": "MIT",
+  "private": true,
+  "bugs": {
+    "url": "https://github.com/emilybache/Theatrical-Players-Refactoring-Kata/issues"
+  },
+  "homepage": "https://github.com/emilybache/Theatrical-Players-Refactoring-Kata",
+  "devDependencies": {
+    "babel": "^5.8.23",
+    "jest": "^24.8.0"
+  }
+}

javascript/src/statement.js

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+
+function statement (invoice, plays) {
+    let totalAmount = 0;
+    let volumeCredits = 0;
+    let result = `Statement for ${invoice.customer}\n`;
+    const format = new Intl.NumberFormat("en-US",
+        { style: "currency", currency: "USD",
+            minimumFractionDigits: 2 }).format;
+
+    for (let perf of invoice.performances) {
+        const play = plays[perf.playID];
+        let thisAmount = 0;
+        switch (play.type) {
+            case "tragedy":
+                thisAmount = 40000;
+                if (perf.audience > 30) {
+                    thisAmount += 1000 * (perf.audience - 30);
+                }
+                break;
+            case "comedy":
+                thisAmount = 30000;
+                if (perf.audience > 20) {
+                    thisAmount += 10000 + 500 * (perf.audience - 20);
+                }
+                thisAmount += 300 * perf.audience;
+                break;
+            default:
+                throw new Error(`unknown type: ${play.type}`);
+        }
+        // add volume credits
+        volumeCredits += Math.max(perf.audience - 30, 0);
+        // add extra credit for every ten comedy attendees
+        if ("comedy" === play.type) volumeCredits += Math.floor(perf.audience / 5);
+        // print line for this order
+        result += ` ${play.name}: ${format(thisAmount/100)} (${perf.audience} seats)\n`;
+        totalAmount += thisAmount;
+    }
+    result += `Amount owed is ${format(totalAmount/100)}\n`;
+    result += `You earned ${volumeCredits} credits\n`;
+    return result;
+}
+
+module.exports = statement;

javascript/test/__snapshots__/statement.test.js.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`example statement 1`] = `
+"Statement for BigCo
+ Hamlet: $650.00 (55 seats)
+ As You Like It: $580.00 (35 seats)
+ Othello: $500.00 (40 seats)
+Amount owed is $1,730.00
+You earned 47 credits
+"
+`;

javascript/test/invoice.json

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+{
+  "customer": "BigCo",
+  "performances": [
+    {
+      "playID": "hamlet",
+      "audience": 55
+    },
+    {
+      "playID": "as-like",
+      "audience": 35
+    },
+    {
+      "playID": "othello",
+      "audience": 40
+    }
+  ]
+}

javascript/test/invoice_new_plays.json

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+{
+  "customer": "BigCoII",
+  "performances": [
+    {
+      "playID": "henry-v",
+      "audience": 53
+    },
+    {
+      "playID": "as-like",
+      "audience": 55
+    }
+  ]
+}

javascript/test/new_plays.json

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+{
+  "henry-v": {"name": "Henry V", "type": "history"},
+  "as-like": {"name": "As You Like It", "type": "pastoral"}
+}

javascript/test/plays.json

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+{
+  "hamlet": {"name": "Hamlet", "type": "tragedy"},
+  "as-like": {"name": "As You Like It", "type": "comedy"},
+  "othello": {"name": "Othello", "type": "tragedy"}
+}

javascript/test/statement.test.js

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+const statement = require('../src/statement');
+const fs=require('fs');
+
+test('example statement', () => {
+    const invoice = JSON.parse(fs.readFileSync('test/invoice.json', 'utf8'));
+    const plays = JSON.parse(fs.readFileSync('test/plays.json', 'utf8'));
+    expect(statement(invoice, plays)).toMatchSnapshot();
+});
+
+test('statement with new play types', () => {
+    const invoice = JSON.parse(fs.readFileSync('test/invoice_new_plays.json', 'utf8'));
+    const plays = JSON.parse(fs.readFileSync('test/new_plays.json', 'utf8'));
+    expect(() => {statement(invoice, plays)}).toThrow(/unknown type/);
+});