From: ts <decoux@...>
Date: 2008-05-08T22:58:36+09:00
Subject: Re: to check for numericality

Albert Schlef wrote:
> Now, when I do "Kernel.methods" I _do_ see "Float", "Integer" etc in the 
> list. Is it the method "Kernel.Float" that eventually gets called? How 
> does ruby know to distinguish between the class Float and the method 
> Kernel.Float?

 Because you use it like a method, i.e. you have added () after it

  Float() ==> method
  Float   ==> constant

> 
> BTW, why, when I do "Object.methods" don't I see "Float", "Integer" etc 
> in the list? Some more methods too are missing. Object is supposed to 
> inherit them from Kernel, doesn't it?

 #Float is a global function, i.e. a Kernel private method  and a
  Kernel singleton method


vgs% ruby -e 'p Kernel.singleton_methods.include?("Float")'
true
vgs%

vgs% ruby -e 'p Kernel.private_instance_methods.include?("Float")'
true
vgs%

vgs% ruby -e 'p Object.private_methods.include?("Float")'
true
vgs% 


Guy Decoux