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# Ruby Quiz #164 - Price Ranges # The PriceRange class represents both the desired price range of the # shopper and the price ranges of the companies. # # company_a = PriceRange.new(:low => 1_000, :high => 3_000) # company_b = PriceRange.new(:low => 6_000, :high => 10_000) # company_c = PriceRange.new(:low => 500, :high => 2_500) # # customer = PriceRange.new(:low => 2_500, :high => 5_000) # # The low and high points are both optional and default to zero and # infinity respectively. # # Once you have the price ranges set up, it's as easy as using the # select method to determine which company the shopper should examine. # # customer.select(company_a, company_b, company_c) # # => [company_a, company_c] # # I decided against using Ruby's Range class for unremembered reasons. # # I didn't leave anything out did I? class PriceRange attr_reader :low, :high def initialize(opts={}) @low = opts[:low] || 0 @high = opts[:high] || 1.0 / 0.0 end def includes_price?(price) price >= @low and price <= @high end def includes_edge_of?(other) includes_price?(other.low) or includes_price?(other.high) end def select(*ranges) ranges.select {|range| self.includes_edge_of?(range) or range.includes_edge_of?(self)} end end

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