From: Wilson Bilkovich <wilsonb@...>
Date: 2007-09-03T05:51:33+09:00
Subject: Re: extract a range start/end?

On 9/2/07, Marcin Grzywaczewski <killavus@gmail.com> wrote:
> 2007/9/2, Michael Linfield <globyy3000@hotmail.com>:
> >
> > if i have a list of dates in an array such as:
> >
> > 4/2/07
> > 4/3/07
> > 4/4/07
> > 4/5/07
> > 4/6/07
> > 4/7/07
> > 4/8/07
> > ect.
> >
> > how would i..based on option parse..pull a starting point and end point
> > of to extract that data range.
> >
> > IE:
> >
> > opts = OptionParser.new do |opts|
> > opts.on("-s", "--startdate", "What start date to use." do |i|
> >    #code to determine to use the starting date
> > end
> >
> > # the same would apply to an --enddate
> >
> > any ideas?
> >
> > i was thinking i could possibly create a new range depending on what the
> > user input was by doing
> >
> > require 'date'
> > results = []
> >
> > (Date.new(2007,4,1)..Date.new(2007,4,8)).each {|r| res << r}
> > but then how would i match that against the original dates for the data?
> >
> > feel free to give me any thoughts.
> >
> > -Thanks
> > --
> > Posted via http://www.ruby-forum.com/.
>
>
> I think that range operates on numbers, and method "to_i" casts class to
> number, so your class should have specific method "to_i".
>

From rdoc:
Ranges can be constructed using objects of any type, as long as
     the objects can be compared using their <=> operator and they
     support the succ method to return the next object in sequence.

In practice, that usually means 'Anything that has Enumerable as an ancestor'