From: "SHIGETOMI, Takuhiko" <tshiget1@...>
Date: 2005-08-30T13:48:35+09:00
Subject: Re: [Q] how to unflatten a flat-array

greetings, Morgan. i concur with your point.

> If I were writing something using this sort of 
> functionality, I think I'd need and expect 
> output something like:
> 
> [nil, "aa", "bb"]
> ["aa", "bb", "cc"]
> ["bb", "cc", "dd"]
> ["cc", "dd", "ee"]
> ["dd", "ee", "ff"]
> ["ee", "ff", "gg"]
> ["ff", "gg", "hh"]
> ["gg", "hh", "ii"]
> ["hh", "ii", "jj"]
> ["ii", "jj", "kk"]
> ["jj", "kk", nil]
> 
> Admittedly, it'd be hard to that reasonably with a
> variable-size window of even length. But for a
> previous-current-next arrangement, it seems to make
> more sense to say "there is no previous" with a nil
> than to basically skip the first item.

true.
what i am focusing on is 'current'. 'previous' and/or 'next' is not the
primary interest but often help 'current' to be dealt with
correctly/easily.

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