From: Todd <toddkennethbenson@...>
Date: 2005-07-29T13:56:01+09:00
Subject: Re: add_weekdays method

Todd wrote:
> Chris Roos wrote:
> > Hi,
> >
> > I've just spent some time looking at an add_weekdays method on the Date
> > class.
> >
> > My implementation is as follows.
> >
> > class Date
> >    def add_weekdays(days)
> >      new_date = self
> >      while days > 0
> >        new_date += 1
> >        days -= 1 unless (new_date.wday == 6 || new_date.wday == 0)
> >      end
> >      new_date
> >    end
> > end
> >
> > I'm interested to know whether I've a) wasted my time because I could
> > have achieved the same thing with an already available object/method b)
> > commited any ruby sins and c) whether there are much better ways of
> > implementing this?
> >
> > Chris
>
> Looks like you want to skip weekends.  I might do it this way...
>
> class Date
>   def add_weekdays(days)
>     new_date = self
>     days.times { new_date += ( new_date.wday == 6 ? 3 : 1 ) }
>   end
> end

Don't listen to that piece of code.  I thought I tested it, but now
that I try it, it fails.  Here we go:

class Date
  def add_weekdays(days)
    new_date = self
    days.times { new_date += ( new_date.wday==5 ? 3 ( new_date.wday==6
? 2 : 1 ) ) }
    return new_date
  end
end

puts Date.today.add_weekdays(4)
#or whatever number

Basically, if it's Friday, add 3, if it's Saturday add 2, otherwise add
1.

Like I said, though, your loop algorithm should work well.

Todd