From: Justin Bailey <jgbailey@...>
Date: 2006-12-21T06:53:25+09:00
Subject: Re: reflecting on objects without creating one

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On 12/20/06, _Kevin <kevin.olbrich@gmail.com> wrote:
>
> Let's say I have two constants
>
> a = Integer
> b = Numeric
>
> Does anyone have any idea how to see if 'a' is a subclass of 'b'
> WITHOUT creating an object of class 'a'?


irb(main):021:0> a = Numeric
=> Numeric
irb(main):022:0> b = Integer
=> Integer
irb(main):023:0> a.ancestors
=> [Numeric, Comparable, Object, Kernel]
irb(main):024:0> a.ancestors.include? b
=> false
irb(main):025:0> b.ancestors.include? a
=> true
irb(main):026:0>

"b.ancestors.include? a" seems to do it. Notice I reversed your definitions
of "a" & "b" (not for any particular reason, that's just how it worked out).

Justin

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