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class Hash
# Merges the caller into +other_hash+. For example,
#
# options = options.reverse_merge(:size => 25, :velocity => 10)
#
# is equivalent to
#
# options = {:size => 25, :velocity => 10}.merge(options)
#
# This is particularly useful for initializing an options hash
# with default values.
def reverse_merge(other_hash)
other_hash.merge(self)
end
# Destructive +reverse_merge+.
def reverse_merge!(other_hash)
# right wins if there is no left
merge!( other_hash ){|key,left,right| left }
end
alias_method :reverse_update, :reverse_merge!
end
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