From: Janus Bor <janus@...>
Date: 2009-08-08T00:18:52+09:00
Subject: How can I copy an array and its elements? (call by value)

Hi all,

I'm failing at something really basic: copying an array and its
contents, so that I can modify the copy without modifying the original.

Here's an example:

irb(main):006:0> a = [1, 2]
=> [1, 2]
irb(main):007:0> b = a
=> [1, 2]
irb(main):008:0> b.delete(1)
=> 1
irb(main):009:0> b
=> [2]
irb(main):010:0> a
=> [2]

I guess the problem is that arrays are called by name not by value, so
that 'b' copy points to the same adress in memory as 'a'. How can I
create an independent copy of 'a'?

Thanks,
 Janus
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