module Gemmy::Patches::HashPatch::InstanceMethods::Inverse

Public Instance Methods

inverse() click to toggle source

facets h = {“a”=>3, “b”=>3, “c”=>3, “d”=>2, “e”=>9, “f”=>3, “g”=>9} h.invert #=> {2=>“d”, 3=>“f”, 9=>“g”} h.inverse #=> {2=>“d”, 3=>[“f”, “c”, “b”, “a”], 9=>[“g”, “e”]} h.inverse.inverse #=> {“a”=>3, “b”=>3, “c”=>3, “d”=>2, “e”=>9, “f”=>3, “g”=>9}

# File lib/gemmy/patches/hash_patch.rb, line 200
def inverse
  i = Hash.new
  self.each_pair{ |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
  }
  return i
end