return date for this week day related to current date

 

Date().nextWeekDay(weekDayNumber)
// 0=Sunday, 1=Monday...

 

Example: Today 2021/10/13 Wednesday

 

I want the date of next Sunday

 

alert(Date().nextWeekDay(0)) // return 2021/10/17 = Sunday

 

I want the date of first Monday of this month, today=2021/10713

 
alert(Date().bom.nextWeekDay(1)) // return 2021/10/04 = first Monday