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module Enumerable
  def to_a(n = nil)
    result = []
    inclusion_condition = true
    return result if n.to_i <= 0 and !block_given?
    each do |*elements|
      elements = elements.first if elements.size == 1
      if block_given?
        values = result.last
        inclusion_condition = yield(*values) unless values.nil?
      else
        inclusion_condition = n != result.size
      end

      if inclusion_condition
        result << elements
      else
        result.pop if block_given?
        break result
      end
    end
    result
  end
end