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class Hash
# Returns a hash that represents the difference between two hashes.
#
# Examples:
#
# {1 => 2}.diff(1 => 2) # => {}
# {1 => 2}.diff(1 => 3) # => {1 => 2}
# {}.diff(1 => 2) # => {1 => 2}
# {1 => 2, 3 => 4}.diff(1 => 2) # => {3 => 4}
def diff(h2)
dup.delete_if { |k, v| h2[k] == v }.merge!(h2.dup.delete_if { |k, v| has_key?(k) })
end
end