How do I get all Sundays between two dates in Ruby?

Question

I\'m working on a form where the user enters a date range and selects from a list of checkboxes a day/days of the week i.e Sunday, Monday, Tuesday, Wednesday, Thursday, Frid

Answer 1

Another approach is to group your date range by wday and pick off your day of the week:

datesByWeekday = (start_date..end_date).group_by(&:wday)
datesByWeekday[0] # All Sundays

for example, to get all Saturdays in March 2019:

> (Date.new(2019,03,01)..Date.new(2019,04,01)).group_by(&:wday)[0]
=> [Sun, 03 Mar 2019, Sun, 10 Mar 2019, Sun, 17 Mar 2019, Sun, 24 Mar 2019, Sun, 31 Mar 2019]

https://apidock.com/ruby/Date/wday