requirebin sketch

index.js

require('console-log').show(true);
var loanCalc = require('loan-calc');

// amortization table calculations
// calculate the monthly payment using loan-calc
// calculate the interest paid per payment
// calculate remaining loan balance
// calculate sum of interest payments
var amortizationCalc = function(amount, rate, totalTerm, amortizeTerm) {
  var monthlyPayment = loanCalc.paymentCalc({amount: amount, rate:rate, termMonths: totalTerm}),
      periodInt = (rate / 12) / 100;

  var i = 0,
      summedInterest = 0,
      summedPrincipal = 0;
  while( i < amortizeTerm) {
    var monthlyIntPaid = amount * periodInt,
        monthlyPrincPaid = monthlyPayment - monthlyIntPaid,
        summedInterest = summedInterest + monthlyIntPaid,
        summedPrincipal = summedPrincipal + monthlyPrincPaid,
        amount = amount - monthlyPrincPaid;
    i += 1;
    
    console.log(monthlyIntPaid);
  }

  return summedInterest;

};

// round numbers to two decimal places
var roundNum = function(num) {
  return Math.round(num * 100) / 100;
};

var amortize = function(opts) {
  var amortized = amortizationCalc(opts.amount, opts.rate, opts.totalTerm, opts.amortizeTerm);
  return roundNum(amortized);
};

console.log(amortize({amount: 180000, rate: 4.25, totalTerm: 360, amortizeTerm: 60}));

minified.js

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o=require("observable");var log=console.log;module.exports=function(opts){opts=opts||{};var emitter=new EventEmitter;var follow=true;opts.max=1e4;opts.margin=opts.margin||30;opts.style=opts.style||{height:"100%",width:"50%"};opts.template=opts.template||function(args){return h("pre",args.map(function(e,i){if(!i)return String(e);try{return JSON.stringify(e,false,2)}catch(e){return String(e)}}).join(" "))};emitter.show=o();var inner=h("div");var logger=h("div",{style:opts.style},{style:{overflow:"scroll",display:o.boolean(emitter.show,"block","none")}},inner);emitter.follow=function(){var el=inner.lastElementChild;el&&el.scrollIntoViewIfNeeded();follow=true};emitter.show(function(v){if(v&&follow)emitter.follow()});emitter.show(true);emitter.end=function(){};emitter.writable=true;emitter.log=emitter.write=function(data){var message=opts.template(data);var bottom=inner.getBoundingClientRect().bottom;var size=logger.getBoundingClientRect().bottom;follow=bottom<size+opts.margin;inner.appendChild(message);if(follow&&emitter.show()){while(inner.clientHeight>opts.max&&inner.children.length){inner.removeChild(inner.firstChild)}message.scrollIntoViewIfNeeded()}return true};emitter.element=logger;return emitter}},{events:1,hyperscript:4,observable:12}]},{},[]);require=function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);throw new Error("Cannot find module '"+o+"'")}var f=n[o]={exports:{}};t[o][0].call(f.exports,function(e){var n=t[o][1][e];return s(n?n:e)},f,f.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s}({VJBKrZ:[function(require,module,exports){"use strict";var paymentCalc=function(loanAmt,loanRate,loanTerm){var monthlyRate=loanRate/100/12;return loanAmt*(monthlyRate/(1-Math.pow(1+monthlyRate,-loanTerm)))};var roundNum=function(num){return Math.round(num*100)/100};var cleanOpts=function(opts){if(isNaN(opts.amount)){opts.amount=parseFloat(opts.amount.replace(/[^0-9\.]+/g,""))}if(typeof opts.amount==="undefined"||isNaN(parseFloat(opts.amount))||opts.amount<=0){throw new Error("Please specify a loan amount as a positive number")}if(typeof opts.rate==="undefined"||isNaN(parseFloat(opts.rate))||opts.rate<0){throw new Error("Please specify a loan rate as a number")}if(typeof opts.termMonths==="undefined"||isNaN(parseFloat(opts.termMonths))||opts.termMonths<=0){throw new Error("Please specify the length of the term as a positive number")}return{amount:opts.amount,rate:opts.rate,termMonths:opts.termMonths||360}};exports.paymentCalc=function(opts){opts=cleanOpts(opts);var monthlyPayment=paymentCalc(opts.amount,opts.rate,opts.termMonths);return roundNum(monthlyPayment)};exports.totalInterest=function(opts){opts=cleanOpts(opts);var monthlyPayment=paymentCalc(opts.amount,opts.rate,opts.termMonths);var rawInterest=monthlyPayment*opts.termMonths-opts.amount;return roundNum(rawInterest)}},{}],"loan-calc":[function(require,module,exports){module.exports=require("VJBKrZ")},{}]},{},[]);require("console-log").show(true);var loanCalc=require("loan-calc");var amortizationCalc=function(amount,rate,totalTerm,amortizeTerm){var monthlyPayment=loanCalc.paymentCalc({amount:amount,rate:rate,termMonths:totalTerm}),periodInt=rate/12/100;var i=0,summedInterest=0,summedPrincipal=0;while(i<amortizeTerm){var monthlyIntPaid=amount*periodInt,monthlyPrincPaid=monthlyPayment-monthlyIntPaid,summedInterest=summedInterest+monthlyIntPaid,summedPrincipal=summedPrincipal+monthlyPrincPaid,amount=amount-monthlyPrincPaid;i+=1;console.log(monthlyIntPaid)}return summedInterest};var roundNum=function(num){return Math.round(num*100)/100};var amortize=function(opts){var amortized=amortizationCalc(opts.amount,opts.rate,opts.totalTerm,opts.amortizeTerm);return roundNum(amortized)};console.log(amortize({amount:18e4,rate:4.25,totalTerm:360,amortizeTerm:60}));

package.json

{
  "name": "requirebin-sketch",
  "version": "1.0.0",
  "dependencies": {
    "console-log": "1.0.0",
    "loan-calc": "0.2.1"
  }
}

page-head.html

<style type='text/css'>html, body { margin: 0; padding: 0; border: 0; }
body, html { height: 100%; width: 100%; }</style>

requirebin.md

made with requirebin