class Hash
inverse from Tilo Sloboda (now in facets)
Public Instance Methods
inverse()
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# File lib/hash/inverse.rb, line 6 def inverse i = Hash.new self.each_pair do |k,v| if (Array === v) ; v.each{ |x| i[x] = ( i.has_key?(x) ? [k,i[x]].flatten : k ) } else ; i[v] = ( i.has_key?(v) ? [k,i[v]].flatten : k ) end end ; i end