Rails - Sep 2013 - Need help to understand the difference between #dup and #clone while working singleton methods

Look the below code with Object#clone:

foo = Object.new
def foo.bar
  "hi"
end
baz = foo.clone
foo.bar # => "hi"
baz.bar # => "hi"

Now with Object#dup

foo = Object.new
def foo.bar
  "hi"
end
baz = foo.dup
foo.bar # => "hi"
baz.bar # `<main>'': undefined method `bar'' for
#<Object:0x989b378>
(NoMethodError)

Why the below part didn''t work.

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I''d think, the difference in following example shows easier, where is
the
difference in you case, too


foo = [1,2]
bar= foo.dup
foo<< 3

puts bar.inspect

foo= [ [1,2] ]
bar = foo.dup
foo[0] << 3

puts bar.inspect

Try it with clone - and you recognize the difference between deep copy
clone and shallow copy dup

In your case you only get a Object.new where you set: baz = foo.dup




On Sun, Sep 22, 2013 at 12:32 AM, Love U Ruby
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
> Look the below code with Object#clone:
>
> foo = Object.new
> def foo.bar
>   "hi"
> end
> baz = foo.clone
> foo.bar # => "hi"
> baz.bar # => "hi"
>
> Now with Object#dup
>
> foo = Object.new
> def foo.bar
>   "hi"
> end
> baz = foo.dup
> foo.bar # => "hi"
> baz.bar # `<main>'': undefined method `bar'' for
#<Object:0x989b378>
> (NoMethodError)
>
> Why the below part didn''t work.
>
> --
> Posted via http://www.ruby-forum.com/.
>
> --
> You received this message because you are subscribed to the Google Groups
> "Ruby on Rails: Talk" group.
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>
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> .
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>
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