From: Vincent Stowbunenko <lists@...>
Date: 2013-04-17T12:51:47+09:00
Subject: Delete method also deletes the original variable

Suppose a code is like this:

array1 = [1,2,3,4,5]
array2 = array1
array2.delete(1)

And the result was:

array2 => [2,3,4,5]
array1 => [2,3,4,5]

How do I make sure the first array stays original after the modification
of second array?

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