From: James Coglan <jcoglan@...>
Date: 2008-08-21T16:19:55+09:00
Subject: Re: each, stuck up...

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>
> I did the following in irb 1.9;
> a = [3, 2, 1, 0, -1, -2, -3]
> a.each {|x| a[x] = x +1}



>
> I'm kind-a obtuse at the moment, could someone please tell me what was
> it that I did wrong.
> I wanted to increment the values of each element of the array.



In the above example, x is the value of each member of the array, not its
position. You want this instead:

a.map! { |x| x + 1 }

map! takes each member of an array and performs some transformation on it,
writing the result back to the array.

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