Compact if/else expression

choose.rb

class TrueClass
  def choose(if_true, if_false)
    if_true
  end
end

class FalseClass
  def choose(if_true, if_false)
    if_false
  end
end

class NilClass
  def choose(if_true, if_false)
    if_false
  end
end

a_string.blank?.choose("Is blank", "Is not blank")

render some_object.some_test?.choose("partial_a", "partial_b")