ES6: Date - Increment Days

Q: Given that normal working days are Monday to Friday. Implement a function to increment a date by X working days.

A: Date.getDay() returns a Map of <number, Day>. Use Date.getDay() to check the current day and set the new Date with Date.setDate().

0: Sunday
1: Monday
2: Tuesday
...
...
6: Saturday

function isWeekend(date: Date) : boolean {
  return date.getDate() % 6 ===0;
}


export function incrementAndReturnNextBuisnessDay (date: Date, days: number): Date{

  date.setDate(date.getDate() +days);
  while(isWeekend(date)){
    date.setDate(date.getDate() + 1);
  }
  return date;