Quick and Dirty interest calc

interestCalc.js

const interestCalc = (init, rate, years) => {
  const pot = [...Array(years).keys()].reduce((acc, c) => {
    const earnings = acc * rate;
    acc += earnings;
    console.log(`Earnings: £${earnings.toFixed(2)}, New Total: £${acc.toFixed(2)}`);
    return acc;
  }, init);
  console.log(`Total: £${pot.toFixed(2)}. Total Earned: £${(pot - init).toFixed(2)}`);
}