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finish tutorial #86

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37 changes: 37 additions & 0 deletions backup/index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link href='http://fonts.googleapis.com/css?family=Roboto:400,300,700' rel='stylesheet' type='text/css'>
<link href="css/styles.css" rel="stylesheet" type="text/css">
</head>
<body>
<header>
<h1>Mortgage Calculator</h1>
</header>
<div class="content">
<div class="form">
<div>
<label>Principal:</label>
<input type="text" id="principal" value="200000"/>
</div>
<div>
<label>Years:</label>
<input type="text" id="years" value="30"/>
</div>
<div>
<label htmlFor="rate">Rate:</label>
<input type="text" id="rate" value="5.0"/>
</div>
<div>
<label htmlFor="calcBtn"></label>
<button id="calcBtn">Calculate</button>
</div>
</div>
<h2>Monthly Payment: <span id="monthlyPayment" class="currency"></span></h2>
<h3>Monthly Rate: <span id="monthlyRate"></span></h3>
</div>
<!-- <script src="js/main.js"></script> -->
<script src="build/main.bundle.js"></script>
</body>
</html>
15 changes: 15 additions & 0 deletions backup/main.js
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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 = calculateMonthlyPayment(principal, years, rate);
//let {monthlyPayment, monthlyRate} = calculateMonthlyPayment(principal, years, rate);
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));
});
30 changes: 30 additions & 0 deletions backup/usingClassModules/main.js
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import Mortgage from './mortgage2';

document.getElementById('calcBtn').addEventListener('click', () => {
let principal = document.getElementById("principal").value;
let years = document.getElementById("years").value;
let rate = document.getElementById("rate").value;
let mortgage = new Mortgage(principal, years, rate);
document.getElementById("monthlyPayment").innerHTML = mortgage.monthlyPayment.toFixed(2);
document.getElementById("monthlyRate").innerHTML = (rate / 12).toFixed(2);
let html = "";
mortgage.amortization.forEach((year, index) => html += `
<tr>
<td>${index + 1}</td>
<td class="currency">${Math.round(year.principalY)}</td>
<td class="stretch">
<div class="flex">
<div class="bar principal"
style="flex:${year.principalY};-webkit-flex:${year.principalY}">
</div>
<div class="bar interest"
style="flex:${year.interestY};-webkit-flex:${year.interestY}">
</div>
</div>
</td>
<td class="currency left">${Math.round(year.interestY)}</td>
<td class="currency">${Math.round(year.balance)}</td>
</tr>
`);
document.getElementById("amortization").innerHTML = html;
});
35 changes: 35 additions & 0 deletions backup/usingClassModules/mortgage2.js
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export default class Mortgage {

constructor(principal, years, rate) {
this.principal = principal;
this.years = years;
this.rate = rate;
}

get monthlyPayment() {
let monthlyRate = this.rate / 100 / 12;
return this.principal * monthlyRate / (1 - (Math.pow(1/(1 + monthlyRate),
this.years * 12)));
}

get amortization() {
let monthlyPayment = this.monthlyPayment;
let monthlyRate = this.rate / 100 / 12;
let balance = this.principal;
let amortization = [];
for (let y=0; y<this.years; y++) {
let interestY = 0;
let principalY = 0;
for (let m=0; m<12; m++) {
let interestM = balance * monthlyRate;
let principalM = monthlyPayment - interestM;
interestY = interestY + interestM;
principalY = principalY + principalM;
balance = balance - principalM;
}
amortization.push({principalY, interestY, balance});
}
return amortization;
}

}
39 changes: 39 additions & 0 deletions backup/usingClasses/index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link href='http://fonts.googleapis.com/css?family=Roboto:400,300,700' rel='stylesheet' type='text/css'>
<link href="css/styles.css" rel="stylesheet" type="text/css">
</head>
<body>
<header>
<h1>Mortgage Calculator</h1>
</header>
<div class="content">
<div class="form">
<div>
<label>Principal:</label>
<input type="text" id="principal" value="200000"/>
</div>
<div>
<label>Years:</label>
<input type="text" id="years" value="30"/>
</div>
<div>
<label htmlFor="rate">Rate:</label>
<input type="text" id="rate" value="5.0"/>
</div>
<div>
<label htmlFor="calcBtn"></label>
<button id="calcBtn">Calculate</button>
</div>
</div>
<h2>Monthly Payment: <span id="monthlyPayment" class="currency"></span></h2>
<h3>Monthly Rate: <span id="monthlyRate"></span></h3>
<div id="amortization"> </div>

</div>
<!-- <script src="js/main.js"></script> -->
<script src="build/main.bundle.js"></script>
</body>
</html>
64 changes: 64 additions & 0 deletions backup/usingClasses/main.js
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class Mortgage {

constructor(principal, years, rate) {
this.principal = principal;
this.years = years;
this.rate = rate;
}

get monthlyPayment() {
let monthlyRate = this.rate / 100 / 12;
return this.principal * monthlyRate / (1 - (Math.pow(1/(1 + monthlyRate),
this.years * 12)));
}

get amortization() {
let monthlyPayment = this.monthlyPayment;
let monthlyRate = this.rate / 100 / 12;
let balance = this.principal;
let amortization = [];
for (let y=0; y<this.years; y++) {
let interestY = 0;
let principalY = 0;
for (let m=0; m<12; m++) {
let interestM = balance * monthlyRate;
let principalM = monthlyPayment - interestM;
interestY = interestY + interestM;
principalY = principalY + principalM;
balance = balance - principalM;
}
amortization.push({principalY, interestY, balance});
}
return amortization;
}

}

document.getElementById('calcBtn').addEventListener('click', () => {
let principal = document.getElementById("principal").value;
let years = document.getElementById("years").value;
let rate = document.getElementById("rate").value;
let mortgage = new Mortgage(principal, years, rate);
document.getElementById("monthlyPayment").innerHTML = mortgage.monthlyPayment.toFixed(2);
document.getElementById("monthlyRate").innerHTML = (rate / 12).toFixed(2);
let html = "";
mortgage.amortization.forEach((year, index) => html += `
<tr>
<td>${index + 1}</td>
<td class="currency">${Math.round(year.principalY)}</td>
<td class="stretch">
<div class="flex">
<div class="bar principal"
style="flex:${year.principalY};-webkit-flex:${year.principalY}">
</div>
<div class="bar interest"
style="flex:${year.interestY};-webkit-flex:${year.interestY}">
</div>
</div>
</td>
<td class="currency left">${Math.round(year.interestY)}</td>
<td class="currency">${Math.round(year.balance)}</td>
</tr>
`);
document.getElementById("amortization").innerHTML = html;
});
153 changes: 153 additions & 0 deletions build/app.bundle.js
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