# Fwd: DayRange (#92)

I thought I should post my original solution that got
me wondering about better solutions and eventually got
me to submit a quiz.

Someone named their class DaySet, and I agree that’s a
better name. I’ll probably change mine to match.

My solution isn’t complete… some additional input
formats requirements were added to make it a more
interesting quiz. Mine only accepts an array of
integers (since that’s what I will be using in my
Rails app anyway). I also changed my argument check
to be similar to James Edward G. II’s.

Also, if anyone is curious about the real-world
application I’m using this for, just send me an email
and I’ll send you the url.

Anyway, here’s my solution:

#DayRange

#DayRange accepts an array of day IDs (Mon = 1, Tue =
2, etc.)
#and returns a formatted string of the days, using day
ranges
#where appropriate, e.g, “Mon-Wed, Fri”

#author: Bryan D.

class DayRange

def day_hash
{ ‘1’=>‘Mon’,
‘2’=>‘Tue’,
‘3’=>‘Wed’,
‘4’=>‘Thu’,
‘5’=>‘Fri’,
‘6’=>‘Sat’,
‘7’=>‘Sun’ }
end

def initialize(day_ids)
@day_ids = day_ids.uniq.sort
unless @day_ids.all? { |d| d.between?(1,7) }
raise ArgumentError “Days must be between 1 and 7”
end

end

#Returns formatted string representing the day array
def to_s
day_abbrs = day_hash
i = 0
#Array of consec_days arrays
consec_day_groups = []
#Array of consecutive days. This gets
#reset when we find a day that is not
#part of a consecutive set of days.
consec_days = []

``````@day_ids.each do |day_id|
if i == 0
#add the day abbr for this day if this is the first
#element of @day_ids.
consec_days << day_abbrs[day_id.to_s]

elsif @day_ids[i-1] == (day_id - 1)
#if this is not the first day in @day_ids, check
#if the previous day in the array is the real life
#previous day of the week.  If so, add it to the
#consec_days array
consec_days << day_abbrs[day_id.to_s]
else
#otherwise start a new consec_days array and
#add the current consec_days array to the
#consec_day_groups array.
consec_day_groups << consec_days

consec_days = []
consec_days << day_abbrs[day_id.to_s]
end
#Always add the consec_days array when this is the
#last day of the @day_ids array
if day_id == @day_ids.last
consec_day_groups << consec_days
end
i += 1
end

day_strings = []
consec_day_groups.each do |c|
if c.length > 2
day_strings <<  c.first.to_s + "-" + c.last.to_s
else
day_strings << c.join(", ")
end
end
return day_strings.join(", ")
``````

end

end