From: nord ehacedod <nordehacedod@...>
Date: 2003-09-03T05:17:41+09:00
Subject: Re: show me the ruby way


ts> metaData = Hash.new {|h, k| h[k] = Hash.new(0) }

Perfect.

B.Candler> Hash.new { |h1,k1| h1[k1] = Hash.new {
|h2,k2| h2[k2]=0 } }

Even better!

Is there an obvious way to implement this
initializtion within the SpecialCaseHash class:

  def new
    super.new {|h, k| h[k] = Hash.new(0) }
  end

doesn't seem to to it.

Thank you.
-
nord

#!/bin/ruby
class SpecialCaseHash < Hash
  def printSortedBy(sortSpecifier='keys')
    puts "---- sorted by #{sortSpecifier}"
    self.keys.sort.each do | m |
      puts m
      if sortSpecifier == 'keys'
        self[m].keys.sort_by {|a| a }.each do | k |
          puts "  #{k.ljust(12)}  #{self[m][k]}"
        end
      elsif sortSpecifier == 'vals'
        self[m].keys.sort_by {|a| -self[m][a] }.each
do | k |
          puts "  #{k.ljust(12)}  #{self[m][k]}"
        end
      end
    end
  end

  def printByKeys
    printSortedBy('keys')
  end

  def printByVals
    printSortedBy('vals')
  end
end

metaData = SpecialCaseHash.new  {|h, k| h[k] =
Hash.new(0) }
metaData['fruit']['apple'] = 13
metaData['fruit']['mango'] = 7
metaData['fruit']['banana'] = 11
metaData['fruit']['cherry'] = 17
metaData['veg']['eggplant'] = 7
metaData['veg']['artichoke'] += 19
metaData['veg']['green bean'] -= 5
metaData['veg']['squash'] += 2
metaData.printByKeys
metaData.printByVals



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