Re: [Rails] Need help to understand the difference between #dup and #clone while working singleton methods

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@ruby-forum.com> 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.

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