From: Michael Malone <michael.malone@...>
Date: 2009-03-04T12:17:07+09:00
Subject: Re: parse a tree

Haris wrote:
> Hi.
>
> How can I parse a tree (arrays within arrays), for example a tree of 
> strings, to print all strings ?
>
> Thanks. 
>
>
>
>   
tree walking hints at a recursive routine...

def tree_walk(array)
    array.each do |item|
        if item.class == Array
           tree_walk(item)
        else
            puts item
        end
    end
end

or for the one-liners among us
def tree_walk(array)
    array.each { |item| (item.class == Array)? tree_walk(item) : puts item }
end

However, I don't reccomend testing on the item.class.  I can't explain 
why very well, but it seems wrong to me.  Maybe someone else can...?

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