# Re: How to find out object type **URL:** \ **Category:** Ruby\ **Created:** [February 20, 2007, 6:17am UTC](https://www.ruby-forum.com/t/re-how-to-find-out-object-type/86139 "2007-02-20T06:17:33Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![Phy\_P](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a587f6/32.png) [@Phy\_P](https://www.ruby-forum.com/u/Phy_P)\ **Post date:** [February 20, 2007, 6:17am UTC](https://www.ruby-forum.com/t/re-how-to-find-out-object-type/86139/1 "2007-02-20T06:17:33Z")
But that then would assume I know what the object might be. I mean, do I really test for all primitive object types? Someone else sent the .class which will give a “hint” as to the class the object was created with. This seems to fit what I was looking for. Many thanks to all! Phy ----- Original Message ---- From: Daniel N [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) To: ruby-talk ML [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) Sent: Monday, February 19, 2007 9:01:44 PM Subject: Re: How to find out object type On 2/20/07, Phy P. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > umm, perhaps I am doing something wrong: > > irb(main):005:0\> o.kind\_of(0) > NoMethodError: undefined method `kind_of' for 123:Fixnum from (irb):5 irb(main):006:0> o.kind_of(1) NoMethodError: undefined method `kind\_of’ for 123:Fixnum > from (irb):6 > irb(main):007:0\> methods may have punctuation in ruby. kind\_of?( OBJECT ) uses a question mark. It makes it into a question. Effectively what happens as I understand it is you ask the object what kind of object are you? eg o.kind\_of?( Fixnum )