nil or empty

gistfile1.rb

require 'test/unit'

class Object
  def blank?
    if self.respond_to?(:empty?)
      if self.class == String then self.strip.empty? else self.empty? end
    else
      self.nil?
    end
  end
end

class BlankTest < Test::Unit::TestCase
  def test_simple
    assert_equal false, 123.blank?
    assert_equal false, 0.blank?

    assert_equal false, "Test".blank?
    assert_equal true, "  ".blank?
    assert_equal true, "".blank?

    assert_equal true, nil.blank?
    assert_equal true, [].blank?
    assert_equal true, {}.blank?
  end
end