Ruby Hash Merge Function for Multiple Hashes

hash_merge.rb

# A little function to easily merge multiple hashes.
# Example: Given h1, ..., h4 are hashes,
# hash_merge(h1, h2, h3, h4)
# or
# hash_merge *[h1, h2, h3, h4]
#
# More on this function and the Ruby syntax presented here at 
# http://yaronwalfish.com/ruby-hash-merge-function-for-multiple-hashes-inject-and-asterisk-notation/
def hash_merge *hashes
  hashes.inject :merge
end