From: Toby O'Rourke <toby@...>
Date: 2008-06-03T21:00:26+09:00
Subject: Re: Price Ranges (#164)

A simple solution to my first Ruby Quiz

class SupplierFinder
  attr_accessor  :companies
  def initialize(suppliers='')
    @companies = Hash.new
    File.open(suppliers).each do |line|
      range = line.scan(/\$[\d,]+/)
      companies.store( Range::new(parse(range[0]),parse(range[1])),
line.match(/^[\w\s]*/))
    end
  end
  def search(switch=nil, low=0, high=0)
    my_range = Range::new(low, high) if switch == '-r'
    companies.each_pair do |range, name|
      puts name if ( !my_range.nil? and (my_range.include? range.first
or my_range.include? range.last or range.include? low or
range.include? high )) or (switch == '-h' and range.first <= low) or
(switch == '-l' and range.last >= low)
    end
  end
  private
  def parse(price)
    price.gsub( '$', '').gsub(',','').to_i
  end
end
SupplierFinder.new(ARGV[0]).search(ARGV[1], ARGV[2].to_i,
ARGV[3].to_i) if __FILE__ == $0

Cheers,

Toby.

On May 31, 1:27 am, "Matthew Moss" <matthew.m...@gmail.com> wrote:
> Apologies for the late quiz... been rather busy today. Here's another simple
> one, but practical. I didn't get specific about input
> formats/parameters/etc, I leave that to you this week.
>
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>
> The three rules of Ruby Quiz 2:
>
> 1.  Please do not post any solutions or spoiler discussion for this
> quiz until 48 hours have passed from the time on this message.
>
> 2.  Support Ruby Quiz 2 by submitting ideas as often as you can! (A
> permanent, new website is in the works for Ruby Quiz 2. Until then,
> please visit the temporary website at
>
>      <http://splatbang.com/rubyquiz/<http://matthew.moss.googlepages.com/home>>.
>
> 3.  Enjoy!
>
> Suggestion:  A [QUIZ] in the subject of emails about the problem
> helps everyone on Ruby Talk follow the discussion.  Please reply to
> the original quiz message, if you can.
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>
> ## Price Ranges
>
> _Quiz description by James Edward Gray II_
>
> You have a list of price ranges from different vendors like:
>
>     Company A:  $1,000 - $3,000
>     Company B:  $6,000 - $10,000
>     Company C:  $500 - $2,500
>
> Given such a list and the desired price range a shopper wishes to pay,
> return the companies the shopper should examine. For example, if the
> shopper's price range was:
>
>     Low:   $2,500
>     High:  $5,000
>
> the companies returned would be:
>
>     Company A
>     Company C
>
> The shopper should also be allowed to provide just a low or just a high
> value instead of both, should they prefer to do so.