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copied!<p>To output to plain HTML you can just perform a recursive call of the same function within a <code>each</code> block (or use the function <em>as</em> the <code>each</code> block as I have done here):</p> <pre><code>def hash_to_html key,value if value.nil? puts "<li>#{key}</li>" elsif value.is_a?(Hash) puts "<li>#{key}" puts "<ul>" value.each(&method(:hash_to_html)) puts "</ul></li>" else fail "I don't know what to do with a #{value.class}" end end puts "<ul>" yourhash.each(&method(:hash_to_html)) puts "</ul>" </code></pre> <p>To output to whatever templating language you're using (HAML, I think), we need to keep track of indentation, so things are a little more complicated -- we're going to use a function that takes the indenting depth as a parameter, and returns another function to be called on each key/value pair that prints that key/value pair (recursively) with appropriate indentation. (In functional programming, calling a function this way is called a "partially applied function", and they're usually a little easier to define than in Ruy.)</p> <pre><code>def hash_to_haml depth lambda do |key,value| puts " "*depth + "%li #{key}" if value.nil? # do nothing # (single this case out, so as not to raise an error here) elsif value.is_a?(Hash) puts " "*(depth+1) + "%ul" value.each(&hash_to_haml(depth+2)) else fail "I don't know what to do with a #{value.class}" end end end puts "%ul" yourhash.each(&hash_to_haml(1)) </code></pre>

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