Get range of dates between two dates

functions.js

// inspired by:
// https://flaviocopes.com/how-to-get-days-between-dates-javascript/
// and modified entry data
const getDatesBetweenDates = (startDate, endDate) => {
  let dates = [];
  //to avoid modifying the original date
  const theDate = new Date(startDate);
  while (theDate < endDate) {
    dates = [...dates, new Date(theDate)];
    theDate.setDate(theDate.getDate() + 1);
  }
  dates = [...dates, endDate];

  return dates;
};

const toYearMonthDayFormat = (dates) => {
  return dates.map((date) => date.toISOString().slice(0, 10));
};

const firstDate = new Date("2021-01-26");
const secondDate = new Date("2021-02-02");

const rangeOfDates = getDatesBetweenDates(firstDate, secondDate);
const rangeOfDatesFormat = toYearMonthDayFormat(rangeOfDates);

console.log(rangeOfDatesFormat);