From: Vincent Angeloni <nospam7272@...>
Date: 2008-04-15T01:16:17+09:00
Subject: Re: noob 'why doesn't this work' question

Luis Lavena wrote:
> On Apr 14, 12:47 pm, Vincent Angeloni <nospam7...@mac.com> wrote:
>> countarray = [3,4,6]
>>
>> and the expected result should be 0,1,2,5, right?
>> What gives?
>>
> 
> Actually no, when you #delete_at one element from an array, the
> indexes of it get altered too:
> 
> You can interpret what is doing #each on countarray:
> 
> irb(main):001:0> sizeList = [0,1,2,3,4,5,6]
> => [0, 1, 2, 3, 4, 5, 6]
> irb(main):002:0> sizeList.delete_at(3)
> => 3
> irb(main):003:0> sizeList.delete_at(4)
> => 5
> irb(main):004:0> sizeList.delete_at(6)
> => nil
> 
> So, each time you iterate over countarray and remove the indicated
> position, sizeList gets updated, and thus, the next items in the
> countarray no longer reference your expected positions.
> 
> Errr, sound complicated my explanation, anyone with a better written
> one? :-)
> 
> HTH,

Ah, yes. I knew it was something simple.
I'll just sort countarray so that the highest index value is first, and
perhaps that will take care of the problem!
Thank you.

vince
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