EMACS5 to EMACS6 using babel

.gitignore

@@ -1 +1,3 @@
-.idea
+.idea
+.gitignore
+node_modules

build/main.bundle.js

@@ -0,0 +1,74 @@
+'use strict';
+
+var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+var Mortgage = function () {
+    function Mortgage(principal, years, rate) {
+        _classCallCheck(this, Mortgage);
+
+        this.principal = principal;
+        this.years = years;
+        this.rate = rate;
+    }
+
+    _createClass(Mortgage, [{
+        key: 'monthlyPayment',
+        get: function get() {
+            var monthlyRate = this.rate / 100 / 12;
+            return this.principal * monthlyRate / (1 - Math.pow(1 / (1 + monthlyRate), this.years * 12));
+        }
+    }, {
+        key: 'amortization',
+        get: function get() {
+            var monthlyPayment = this.monthlyPayment;
+            var monthlyRate = this.rate / 100 / 12;
+            var balance = this.principal;
+            var amortization = [];
+            for (var y = 0; y < this.years; y++) {
+                var interestY = 0;
+                var principalY = 0;
+                for (var m = 0; m < 12; m++) {
+                    var interestM = balance * monthlyRate;
+                    var principalM = monthlyPayment - interestM;
+                    interestY = interestY + interestM;
+                    principalY = principalY + principalM;
+                    balance = balance - principalM;
+                }
+                amortization.push({ principalY: principalY, interestY: interestY, balance: balance });
+            }
+            return amortization;
+        }
+    }]);
+
+    return Mortgage;
+}();
+
+document.getElementById('calcBtn').addEventListener('click', function () {
+    var principal = document.getElementById("principal").value;
+    var years = document.getElementById("years").value;
+    var rate = document.getElementById("rate").value;
+    var mortgage = new Mortgage(principal, years, rate);
+    document.getElementById("monthlyPayment").innerHTML = mortgage.monthlyPayment.toFixed(2);
+    document.getElementById("monthlyRate").innerHTML = (rate / 12).toFixed(2);
+    var html = "";
+    mortgage.amortization.forEach(function (year, index) {
+        return html += '\n        <tr>\n            <td>' + (index + 1) + '</td>\n            <td class="currency">' + Math.round(year.principalY) + '</td>\n            <td class="stretch">\n                <div class="flex">\n                    <div class="bar principal"\n                         style="flex:' + year.principalY + ';-webkit-flex:' + year.principalY + '">\n                    </div>\n                    <div class="bar interest"\n                         style="flex:' + year.interestY + ';-webkit-flex:' + year.interestY + '">\n                    </div>\n                </div>\n            </td>\n            <td class="currency left">' + Math.round(year.interestY) + '</td>\n            <td class="currency">' + Math.round(year.balance) + '</td>\n        </tr>\n    ';
+    });
+    document.getElementById("amortization").innerHTML = html;
+});
+
+/*
+import * as mortgage from './mortgage';
+
+document.getElementById('calcBtn').addEventListener('click', () => {
+    let principal = document.getElementById("principal").value;
+    let years = document.getElementById("years").value;
+    let rate = document.getElementById("rate").value;
+    let {monthlyPayment, monthlyRate, amortization} = mortgage.calculateAmortization(principal, years, rate);
+    document.getElementById("monthlyPayment").innerHTML = monthlyPayment.toFixed(2);
+    document.getElementById("monthlyRate").innerHTML = (monthlyRate * 100).toFixed(2);
+    amortization.forEach(month => console.log(month));
+});
+*/