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stringsn88keys/invert_as_arrays.rb

Created September 12, 2013 16:30
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Patch to invert mappings of [key, value] in Hash to mappings of [value, [key1, key2, key3]]
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invert_as_arrays.rb
class Hash
def invert_as_arrays
self.inject({}) { |r,x| r[x[1]] ||= []; r[x[1]] << x[0]; r }
end
end
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