James Gray
8/29/2006 6:26:00 PM
I tried to send this before, but it didn't seem to go through.
Trying again. Sorry if this is a duplicate.
James Edward Gray II
Begin forwarded message:
> From: st103@doc.ic.ac.uk
> Date: August 29, 2006 5:37:24 AM CDT
> To: submission@rubyquiz.com
> Subject: Please Forward: Ruby Quiz Submission
>
> Hi James. Here's my submission for number 92. Short, and reasonably
> sweet.
>
> Regards,
> Stuart
>
> #a cute little helper method to do the hard work
> class Array
> def split &blk
> #split the array into little arrays at boundary where block
> evals to true
> i=0
> r = []
> while i<length
> start=i
> loop do
> i+=1
> break if blk.call(at(i-1), at(i))
> if i==length-1
> i+=1
> break
> end
> end
> r << slice(start..i-1)
> end
> r
> end
> end
>
> # i personally don't really see the point of wrapping this up in a
> class
> def dayrange *args
> r = []
> days = ['Mon','Tue','Wed','Thu','Fri','Sat','Sun']
> args.collect!{|d| days.include?(d) ? days.index(d) : d }
> raise ArgumentError.new("invalid arguments #{args.inspect} for
> dayrange")
> unless (args - (0..6).to_a).empty?
> args.sort.split{|a,b| a.succ != b}.each{|d|
> if d.size>=3
> r << days[d[0]] + '-' + days[d[-1]]
> else
> r.concat d.collect{|n| days[n]}
> end
> }
> r.join(',')
> end
>
> #some examples
> puts dayrange(0,2,3,4,6)
> puts dayrange('Mon','Tue','Wed', 'Fri')
> puts dayrange(0,'Tue',2,'Sat')
> puts dayrange(4,2,5,1,3)