From: 7stud -- <lists@...>
Date: 2012-12-29T08:08:43+09:00
Subject: Re: Ruby Koans regarding Hashes.

7stud -- wrote in post #1090511:
>
>
> No.  Inside the block, the code assigns an array reference to the key.
> Then the block returns a reference to the same array.    Two references
> to the same array.  Either one can be used to change the array.  Here is
> a simple example of that:
>
> ref1 = {}
> ref2 = ref1
>
> ref1[:a] = 10
> ref2[:b] = 20
>
> p ref1
>
> --output:--
>
> {:a=>10, :b=>20}
>

Whoops.  An example of two references to the same array would like this:

ref1 = []
ref2 = ref1

ref1 << 10
ref2 << 20

p ref1

--output:--
[10, 20]


my_hash = {}

array_ref = my_hash[:one] = []
array_ref << 'hello' << 'world'

--output:--
{:one=>["hello", "world"]}

p my_hash

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