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Class / Interitance / Test program example showing good practise
More Classes and Objects example from a Well House Consultants training course
More on More Classes and Objects [link]
Source code: transact.rb Module: R108
# fiona hotel 1 # joan breakfast 2 class Transact @@transact_name = { "Hotel" => "Well House Manor Room", "Breakfast" => "Chez Tiffany", "Event" => "Open Source Course" } def Transact.factory(input) input.chomp! parts = input.split "\t" if parts[1] == "hotel" output = Hotel.new(parts[0],parts[2].to_i) else output = Breakfast.new(parts[0],parts[2].to_i) end return output end def Transact.costliest(collection) so_far = collection[0] collection.each do |perhaps| so_far = so_far.costlier(perhaps) end return so_far end def costlier(other) c1 = self.getvalue c2 = other.getvalue return c1 < c2 ? other : self end def initialize(whom,howmany) @whom = whom @howmany = howmany end def getname() return @whom end def gethowmany() return @howmany end def to_s r_value = @@transact_name[self.class.to_s] r_value += ". In the name of #{@whom}" r_value += ". For #{@howmany} people." return r_value end end class Hotel < Transact def getvalue() return (70 + 10 * @howmany).to_f end def + (extra) people = self.getname + " and " + extra.getname count = self.gethowmany + extra.gethowmany return Hotel.new people, count end end class Breakfast < Transact def getvalue() return 5.95 * @howmany end end def formatted_price(amount) return sprintf "%.2f", amount end if __FILE__ == $0 sageroll = [ Hotel.new("Rhona", 1) + Hotel.new("Tom", 1) + Hotel.new("Valma", 1) ] fh = File.new "transact.data" fh.readlines.each do |current| sageroll.push Transact::factory(current) end sageroll.each do |current| print "#{current}; " puts "Value is #{formatted_price(current.getvalue)}" end top_income = Transact::costliest(sageroll) puts "\nTop income was from #{top_income}" puts "Invoice value: #{formatted_price(top_income.getvalue)}" end Learn about this subject
This module and example are covered on the following public courses:
* Learning to program in Ruby * Ruby Programming Also available on on site courses for larger groups Books covering this topic
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