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Using arrow functions and setting up webpack

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Raghu-Ch
2017-02-13 23:41:00 -08:00
parent 7a67d66221
commit 0ddde3bf1b
5 changed files with 157 additions and 9 deletions
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25
js/main.js
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@@ -1,4 +1,4 @@
let calculateMonthlyPayment = function (principal, years, rate) {
let calculateMonthlyPayment = (principal, years, rate) => {
let monthlyRate = 0;
if (rate) {
monthlyRate = rate / 100 / 12;
@@ -13,12 +13,31 @@ let calculateMonthlyPayment = function (principal, years, rate) {
// monthlyPayment: monthlyPayment,
// monthlyRate: monthlyRate };
};
let calculateAmortization = (principal, years, rate) => {
let {monthlyRate, monthlyPayment} = calculateMonthlyPayment(principal, years, rate);
let balance = principal;
let amortization = [];
for (let y=0; y<years; y++) {
let interestY = 0; // Interest payment for year y
let principalY = 0; // principal payment for year y
for (let m=0; m<12; m++) {
let interestM = balance * monthlyRate; // Interest payment for month m
let principalM = monthlyPayment - interestM; //principal payment for month m
interestY = interestY + interestM;
principalY = principalY + principalM;
balance = balance - principalM;
}
amortization.push({principalY, interestY, balance})
}
return {monthlyPayment, monthlyRate, amortization};
};
document.getElementById('calcBtn').addEventListener('click', function () {
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} = calculateMonthlyPayment(principal, years, rate);
let {monthlyPayment, monthlyRate, amortization} = 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));
});