activesupport/lib/active_support/core_ext/numeric/inquiry.rb


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class Numeric
  # Returns true if the number is positive.
  #
  #   1.positive?  # => true
  #   0.positive?  # => false
  #   -1.positive? # => false
  def positive?
    self > 0
  end

  # Returns true if the number is negative.
  #
  #   -1.negative? # => true
  #   0.negative?  # => false
  #   1.negative?  # => false
  def negative?
    self < 0
  end
end