Passing Table Type Variables to User Defined Functions

Question

I have a function that returns number of workdays between 2 dates.  I need it to exclude a set of holidays from that count.  I created a table type variable to pass to my function, but cannot figure out how to get a number of holidays in the table type between the two dates. 

 

My code:

DECLARE @Holidays HolidayType
INSERT INTO @Holidays(Holiday) VALUES('New Years Day','Memorial Day','Fourth of July','Labor Day','Thanksgiving Day','Christmas Day');
INSERT INTO @Holidays(HolidayDate) VALUES('1/1/2019','5/27/2019', '7/4/2019','9/2/2019', '11/28/2019', '12/25/2019');
Select * from @Holidays
--Get Weekdays
IF OBJECT_ID('GetWeekdays') IS NOT NULL
DROP FUNCTION GetWeekdays
Go
Create FUNCTION GetWeekdays
(
-- Add the parameters for the function here
@startDate date,
@endDate date
--@Holidays HolidayType READONLY
)
RETURNS int
AS
BEGIN
declare @full_weeks int,@remaining_days int,@work_days_in_full_weeks int,@startingWeekday int, @work_days_in_partial_week int,@HolidayNumber HolidayType READONLY
set @full_weeks = (datediff(d,@startDate,@endDate)+1)/7
set @remaining_days = (datediff(d,@startDate,@endDate)+1)%7
set @work_days_in_full_weeks = @full_weeks*5
set @startingWeekday = datepart(dw,@startDate)
set @work_days_in_partial_week = @remaining_days - case when @startingWeekday = 1 then 1 when @startingWeekday = 7 then 2 when @remaining_days+@startingWeekday-1=7 then 1 when @remaining_days+@startingWeekday-1>=8 then 2 else 0 end
set @work_days_in_partial_week=case when @work_days_in_partial_week<0 then 0 else @work_days_in_partial_week end
--Need a variable for the number of holidays that would equal the number of holidays
return @work_days_in_full_weeks+@work_days_in_partial_week --This needs to subtract the number of holidays from the variable in the previous line
END
Go
DECLARE @WeekdaysToDate INT
Select @WeekdaysToDate = dbo.GetWeekdays(CAST(DATEADD(month, DATEDIFF(month, 0, GETDATE()), 0)AS DATE),getdate()-1)