From: Ross Bamford <rosco@...>
Date: 2006-01-09T11:23:01+09:00
Subject: Re: Iterator Fu Failing Me

On Mon, 09 Jan 2006 01:45:11 -0000, Ross Bamford  
<rosco@roscopeco.remove.co.uk> wrote:

> On Mon, 09 Jan 2006 01:09:23 -0000, James Edward Gray II  
> <james@grayproductions.net> wrote:
>
>> On Jan 8, 2006, at 6:58 PM, jwesley wrote:
>>
>>> Perhaps I'm missing the point, but wouldn't the following work: (?)
>>>
>>>    elements = tokens.map do |token|
>>>      val = nil
>>>      [ClassA, ClassB, ClassC].find { |kind| val = kind.parse?(token) }
>>>      val
>>>    end
>>
>> It works just fine, yes.  Just doesn't feel very Rubyish to me.   
>> <shrugs>
>>
>
> Not sure this is more Rubyish (seems a bit line-noisy) but:
>

This one looks worse, but at least really does seem to work this time:

	r = tokens.inject([]) do |arr,token|
	  arr << parsers.zip([token]*parsers.length).inject(nil) do |out,pt|
	    out or pt[0].parse?(pt[1])
	  end
	end

slotted into the code before and it gives:

	["one", "two", "one", nil, nil, "three"]

Sorry about that.

-- 
Ross Bamford - rosco@roscopeco.remove.co.uk