From: Michael Neumann <mneumann@...>
Date: 2004-12-14T02:45:22+09:00
Subject: Re: Hash freezes String keys are returns copy

ts wrote:
>>>>>>"M" == Michael Neumann <mneumann@ntecs.de> writes:
> 
> 
> 
> M> But why does this work:
> 
> M>    a = []
> M>    hash[a] = "test"
> M>    a[0] = "1"
> M>    p hash.keys
> M>    # => returns [ ["1"] ]
> 
> uln% cat b.rb
> #!/usr/local/bin/ruby
> a = []
> hash = { a => "test"}
> a[0] = "1"
> p hash[a]
> uln% 
> 
> uln% b.rb
> nil
> uln% 

okay... but isn't it the same when using a String?

   a = ""
   hash = { a => "test" }
   a << "1"
   p hash[a] # => nil
   p hash.keys # => [""]

while:

   a = []
   hash = { a => "test" }
   a << "1"
   p hash[a] # => nil
   p hash.keys # => [["1"]]

they behave differently.

Regards,

   Michael