A couple of questions regarding the top-level environment of execution.
* The Pickaxe says on page 376 that top-level methods are defined as private instance methods of Object, whereas Ruby for Rails says on page 203 they are private instance methods of the Kernel module. Which one is correct?
* Which is the actual container of a top-level constant?
-- fxn
Hi --
A couple of questions regarding the top-level environment of execution.
* The Pickaxe says on page 376 that top-level methods are defined as private instance methods of Object, whereas Ruby for Rails says on page 203 they are private instance methods of the Kernel module. Which one is correct?
The Pickaxe is right. I believe it got fixed in later printings of
R4R, though. I can't remember what led to the original mistake -- I
think I misinterpreted some method-list output I was getting while
examining it all in irb, or something.
* Which is the actual container of a top-level constant?
You may not want me to answer 
But I do believe it's Object.
ruby -ve "A=1; Object::A; Kernel::A"
ruby 1.8.6 (2007-03-13 patchlevel 0) [i686-darwin8.10.1]
-e:1: uninitialized constant Kernel::A (NameError)
(plus a couple of void context warnings which don't matter)
David
On Sun, 11 Nov 2007, Xavier Noria wrote:
--
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* Advancing With Rails, Berlin, Germany, November 19-22
* Intro to Rails, London, UK, December 3-6 (by Skills Matter)
See http://www.rubypal.com for details!
Looks like the pickaxe:
def foo
end
self.private_methods.include?("foo") # => true
Object.private_instance_methods(false).include?("foo") # => true
Kernel.private_instance_methods(false).include?("foo") # => false
Note though that in irb top level methods are public:
irb(main):001:0> def foo
irb(main):002:1> end
=> nil
irb(main):003:0>
irb(main):004:0* self.private_methods.include?("foo")
=> false
irb(main):005:0> Object.private_instance_methods(false).include?("foo")
=> false
irb(main):006:0> Kernel.private_instance_methods(false).include?("foo")
=> false
irb(main):007:0> Object.instance_methods(false).include?("foo")
=> true
irb(main):008:0>
On Nov 10, 2007 12:10 PM, Xavier Noria <fxn@hashref.com> wrote:
A couple of questions regarding the top-level environment of execution.
* The Pickaxe says on page 376 that top-level methods are defined as
private instance methods of Object, whereas Ruby for Rails says on
page 203 they are private instance methods of the Kernel module. Which
one is correct?
--
Rick DeNatale
My blog on Ruby
http://talklikeaduck.denhaven2.com/