From: "Weirich, James" <James.Weirich@...>
Date: 2003-09-12T23:57:15+09:00
Subject: Re: OO Challenge

I'll throw in my version.  Logically it is structured very much like Robert
Klemme's except that I made lighter weight choices for some of the
abstractions.  For example, I use simple procs for the tax groups and my
TaxPayer is Struct based.   What is really interesting is that despite the
differences in representation, the last bits of our programs are identical
except for minor spelling differences.  

Here's the code.

-----------------------------------------------------
Soldier   = proc { |p| p.salary / 10.0 }
Professor = proc { |p| p.salary / 15.0 + 100 }

TaxPayer = Struct.new(:salary, :tax_classes)
class TaxPayer
  def tax
    tax_classes.collect { |tc| tc.call(self) }.max
  end
end

taxpayers = [
  TaxPayer.new(3000, [Soldier])
  TaxPayer.new(5000, [Professor])
  TaxPayer.new(6000, [Professor, Soldier])
]

Taxpayers.each { |tp| printf "%0.2f\n", tp.tax }
----------------------------------------------------

Disclaimer: I don't believe this example says anything deep or significant
about OO verse non-OO.  

-- 
-- Jim Weirich / Compuware
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