Ruby

I am working on an app where I need to process various data-items based upon different ruby types. While setting up conditonal-checks, I discovered that "unless" fails to handle plural conditions.

Please consider the following example:

class ThingA end class ThingB end class ThingC end # obj = ThingA.new # obj = ThingB.new obj = ThingC.new # puts 'yes it is a ThingC' unless obj.is_a?(ThingA) && obj.is_a?(ThingB) # BUG # puts 'yes it is a ThingC' if !obj.is_a?(ThingA) && !obj.is_a?(ThingB) # this works ok # works ok with singular condition unless obj.is_a?(ThingA) unless obj.is_a?(ThingB) puts 'yes it is a ThingC' end end 

Thanks.

Regards,
Imran