Initial commit

js/main.js

@@ -0,0 +1,24 @@
+let calculateMonthlyPayment = function (principal, years, rate) {
+    let monthlyRate = 0;
+    if (rate) {
+        monthlyRate = rate / 100 / 12;
+    }
+    let monthlyPayment = principal * monthlyRate / (1 - (Math.pow(1 / (1 + monthlyRate), years * 12)));
+    return {principal, years, rate, monthlyPayment, monthlyRate};
+    // Creating Objects from Variables ## ES6
+    // shorted for the following ES5 syntax
+    // return { principal: principal,
+    //      years: years,
+    //      rate: rate,
+    //      monthlyPayment: monthlyPayment,
+    //      monthlyRate: monthlyRate };
+};
+
+document.getElementById('calcBtn').addEventListener('click', function () {
+    let principal = document.getElementById("principal").value;
+    let years = document.getElementById("years").value;
+    let rate = document.getElementById("rate").value;
+    let {monthlyPayment, monthlyRate} = calculateMonthlyPayment(principal, years, rate);
+    document.getElementById("monthlyPayment").innerHTML = monthlyPayment.toFixed(2);
+    document.getElementById("monthlyRate").innerHTML = (monthlyRate*100).toFixed(2);
+});