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# miteshmap/savings_func.js

Last active January 2, 2020 16:37
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small savings
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 /** * The script is created purely based the video I saw on youtube about * Personal finance on how to save money with small savings. * * If you invest 2 INR a day,In a year you can save around 133590 INR. * * The calculation goes like if on the 1st of january you save 2 rupees * 2nd january you have to save 2*2 = 4 and 3 day 2*3 = 6 and likewise. * * You can not ideally transac this small amount to the bank, so I created * this script to calculate monthly savings, so you can put that amount aside * for any given month. */ /** * Amount to pay on any given day. * * This will give you the money that you have to save on the 70th day of the * year and it will return the today's saving and total saving till the given * day * * @param {*} day * @param {*} dailyInvest */ function amountToPay(day, dailyInvest = 2) { let currentInvest = 0; let amount = 0; for (let i = 1; i <= day; i++) { currentInvest = i * dailyInvest; amount = amount + currentInvest; } return { today: currentInvest, total: amount }; } /** * Amount to pay in a month. * * Pass the month and a year and this will given you how money you * Need to invest for the given month. * * @param {*} month * @param {*} year */ function amountToPayInMonth(month, year) { const { firstDay, lastDay } = daysNumberOfMonth(month, year); const { total: firstDayPay } = amountToPay(getDayOfTheYear(firstDay)); const { total: lastDayPay } = amountToPay(getDayOfTheYear(lastDay)); // console.log(firstDayPay); return lastDayPay - firstDayPay; } /** * First and last day of the month. * * @param {*} month * @param {*} year */ function daysNumberOfMonth(month, year) { var date = new Date(year + "-" + month + "-01"); var firstDay = new Date(date.getFullYear(), date.getMonth(), 1); var lastDay = new Date(date.getFullYear(), date.getMonth() + 1, 0); return { firstDay: firstDay, lastDay: lastDay }; } /** * Get the number of day of the given date. * * returns the number of the day in a year, if you want to know * what's the day in year is 29th of august. it accepts the date * object or array [year, month, day]. * * @param {*} dateobj * Date object or array [year, month, day]. */ function getDayOfTheYear(dateobj) { const currentdate = Array.isArray(dateobj) ? new Date(dateobj.join("-")) : dateobj; const timestmp = new Date().setFullYear(new Date().getFullYear(), 0, 1); const yearFirstDay = Math.floor(timestmp / 86400000); const today = Math.ceil(currentdate.getTime() / 86400000); const dayOfYear = today - yearFirstDay; return dayOfYear + 1; } /** * Total saving in year. */ let totalpay = 0; for (let i = 1; i <= 12; i++) { const currentPay = amountToPayInMonth(i, "2020"); totalpay = totalpay + currentPay; } // const pay = amountToPayInMonth("01", "2020"); console.log(totalpay); // console.log(getDayOfTheYear(month.lastDay)); console.log(amountToPay(365));