Joel VanderWerf wrote: > irb(main):001:0> ObjectSpace.each_object(Class) {|cl| p cl if cl < > Numeric} Thank you. Why does it return 387 after I do this in IRB? like this: irb(main):069:0> ObjectSpace.each_object(Class) {|cl| p cl if cl < Date} DateTime => 387 -- Posted via http://www.ruby-forum.com/.