From: Dominik Bathon <dbatml@...>
Date: 2005-04-11T21:35:43+09:00
Subject: Re: [SOLUTION] Knight's Travails (#27)

On Mon, 11 Apr 2005 06:49:37 +0200, Timothy Byrd <byrd.timothy@gmail.com>  
wrote:

>> Btw. does anybody know if this behavior is defined
>> somewhere (adding elements to an Array while
>> iterating over it):
>> irb(main):001:0> (a=[0]).each { |i| a << i+1 if i < 10 }; a
>> => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
>
> If you just want to accumualte an array, here is a snippet from the
> Programming Ruby HTML book:
>
> (1..10).to_a  � [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Thanks for the reply, but that wasn't the intetion.

While coding the solution, I first had something like this in my find_path  
method:

front=[start]
until front.empty?
   pos=front.shift
   all_moves(pos) { |m|
     if ...
       front << m
     end
   }
end

I experimented a bit and changed it to the following:

(front=[start]).each { |pos|
   all_moves(pos) { |m|
     if ...
       front << m
     end
   }
}

It basicly does the same. And I wondered if this is "defined" behavior, or  
if it is just coincidence, that it works (adding elements to front, while  
iterating over it).

Dominik