This code enables safe navigation via the function '_?'.

safe_navigation.rb

# This code enables safe navigation via the function '_?'. Examples of
# usage:
#
#  "test"._?.no_such_method # NoMethodError
#  "  test "._?.strip #=> "test"
#  nil._?.strip #=> nil
#
# In summary, `obj._?.some_method` can be thought of as doing
# `obj.nil? ? nil : obj.some_method`

Object.class_eval { def _? ; self ; end }

NilClass.class_eval { def _? ; SafeNilClass.new ; end }

class SafeNilClass
  def method_missing(*args, &block)
    nil.send(*args, &block) rescue nil
  end
end