Simple enum creation

module Kernel
# simple (sequential) enumerated values
def enum(*syms)

syms.each { s const_set(s, s.to_s) }
const_set(:DEFAULT, syms.first) unless syms.nil?
end
end

//and the usage
require 'kernel'

module Constants
module Gradient
enum :DOWNSLOPE, :LEVEL, :UPSLOPE
end

module TreeCover
enum :GOOD, :BAD, :OK
end

module TrafficDensity
enum :LOW, :MEDIUM, :HIGH
end
end