From: Edward Faulkner <ef@...>
Date: 2006-03-02T00:50:05+09:00
Subject: Re: Indexing system - ruby newbie

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On Thu, Mar 02, 2006 at 12:14:47AM +0900, Adam Groves wrote:
> But I'm stuck here.
>=20
>   (1...n).inject("A") { |curr, i| curr.succ}
>=20
> I still can't quite get my head around blocks beyond .each do |x|

#inject is one of the basic tools of functional programming.  That's
why it seems hard.  It's a very different way of thinking.  And also
very powerful.

That said, I think this case is a completely gratuitious use of
inject.  The tipoff is that the argument "i" is completely ignored.

I like this much better:

def letter(n)
  return '_' if n=3D=3D0
  n=3D=3D1 ? "A" : letter(n-1).succ
end

regards,
Ed

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