From: tenten <tmaekawa@...>
Date: 2012-09-20T14:06:35+09:00
Subject: Re: the behavior of iterator methods

> i is a local variable to the block.  each() assigns each value in the
> array to the variable i.  Then you add 1 to i,  then the block ends and
> the variable i is destroyed.  That has no effect on the original array.

That's where I misunderstood.
I don't know why, but I thought the 'i' vareable like a pointer of a 
pointer in C/C++. Maybe I was confused.

Now I can understand what was wrong.
Thank you very much.