From: Robert Klemme <shortcutter@...>
Date: 2008-09-10T18:40:07+09:00
Subject: Re: yield/block question

2008/9/10 Kenneth McDonald <kenneth.m.mcdonald@sbcglobal.net>:
> On Sep 9, 2008, at 7:17 PM, Serabe wrote:
>
>> What about this?
>>
>> class Array
>>  def each_leaf(&block)
>>   each do |x|
>>     case x
>>     when Array: x.each_leaf &block
>>     else block.call x
>>     end
>>   end
>>  end
>> end

This can be generalized to Enumerable.  Still a handicap is that this
does not gracefully deal with structures which are not cycle free.

Just some toying around:

module Enumerable
  def each_leaf(cl = Object, &b)
    each do |el|
      case el
        when String
          yield el if cl === el
        when Enumerable
          el.each_leaf(cl, &b)
        when cl
          yield el
        else
          # ignore
      end
    end
  end
end

Kind regards

robert

-- 
use.inject do |as, often| as.you_can - without end