From: Adam Groves <adam.groves@...>
Date: 2006-03-02T00:14:47+09:00
Subject: Re: Indexing system - ruby newbie

Dear Ross,

it works a treat but I'm having a bit of trouble figuring out what's 
going on.

 	  (n < 1) ? '_' : (1...n).inject("A") { |curr, i| curr.succ }

I get this:
if n<1
  '_'
else

But I'm stuck here.

  (1...n).inject("A") { |curr, i| curr.succ}

I still can't quite get my head around blocks beyond .each do |x|


Ross Bamford wrote:
> On Wed, 2006-03-01 at 22:33 +0900, Dave Burt wrote:
>> Try this:
>> 
>> n = ""
>> while(n > 0)
>>   s << ?A + n % 26 - 1
>>   n /= 26
>> end
>> n << "-" if n.empty?
>> s.reverse
>> 
>> Also, your @alphabet is ("a".."z").to_a
> 
> This isn't as good as Dave's (it's potentially *lots* slower for a
> start) but, well, I'm just an #inject addict really...:
> 
> 	def letter(n)
> 	  (n < 1) ? '_' : (1...n).inject("A") { |curr, i| curr.succ }
> 	end
> 
> 	letter(0)
> 	# => "_"
> 	letter(1)
> 	# => "A"
> 	letter(10)
> 	# => "J"
> 	letter(27)
> 	# => "AA"
> 	letter(397)
> 	# => "OG"


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