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class Array
# Returns an unique array based on the criteria given as a +Proc+.
#
# [1, 2, 3, 4].uniq_by { |i| i.odd? } # => [1, 2]
#
def uniq_by
hash, array = {}, []
each { |i| hash[yield(i)] ||= (array << i) }
array
end
# Same as uniq_by, but modifies self.
def uniq_by!
replace(uniq_by{ |i| yield(i) })
end
end