Find Next Day

Find Next Day

function getDay(day) {
  let searchDay = -1
  switch (day.toLowerCase()) {
    case 'sunday':
      searchDay = 0
      break;
    case 'monday':
      searchDay = 1
      break;
    case 'tuesday':
      searchDay = 2
      break;
    case 'wednesday':
      searchDay = 3
      break;
    case 'thursday':
      searchDay = 4
      break;
    case 'friday':
      searchDay = 5
      break;
    case 'saturday':
      searchDay = 6
      break;
    default:
      break;
  }
  let d = new Date();

  Date.prototype.addDays = function(days) {
    var date = new Date(this.valueOf());
    date.setDate(date.getDate() + days);
    return date;
  }


  for (let index = 1; index < 8; index++) {
    d = d.addDays(1)
    if (d.getDay() == searchDay) {
      return d
    }
  }
}

console.log(getDay('Monday'))

https://jsfiddle.net/vinbhai4u/rvw8h0k1/