Day of week

day.js

/*
  getDay returns a number that represents the day of the week.
  
  In programming, we never start at 1 when counting. We start at 0!
  Therefore, the seven days of the week are 0-6 (not 1-7).
  
  0 is Sunday
  1 is Monday
  2 is Tuesday
  3 is Wednesday
  4 is Thursday
  5 is Friday
  6 is Saturday
*/
let day = new Date().getDay();


switch (day) {
  case 1:
  case 2:
  case 3:
  case 4:
  case 5:
    console.log("Today is a weekday")
    break;
  case 0:
  case 6:
    console.log("Today is a weekend day");
    break;
}