Exclude a list of natrual number : As Set « Array « Ruby

1. Ruby
2. Array
3. As Set

Exclude a list of natrual number

def natural_numbers_except(exclude)
  exclude_map = {}
  exclude.each { |x| exclude_map[x] = true }
  x = 1
  while true
    yield x unless exclude_map[x]
    x = x.succ
  end
end

natural_numbers_except([2,3,6,7]) do |x|
 break if x > 10
 puts x
end
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