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    copied!<pre><code>a = {} a[:bitrate] = ["100", "500", "1000"] a[:fps] = ["15", "30"] a[:qp] = ["20", "30"] def product_hash(hsh) attrs = hsh.values keys = hsh.keys product = attrs[0].product(*attrs[1..-1]) product.map{ |p| Hash[keys.zip p] } end product_hash(a) </code></pre> <p>you'll get</p> <pre><code>[{:bitrate=&gt;"100", :fps=&gt;"15", :qp=&gt;"20"}, {:bitrate=&gt;"100", :fps=&gt;"15", :qp=&gt;"30"}, {:bitrate=&gt;"100", :fps=&gt;"30", :qp=&gt;"20"}, {:bitrate=&gt;"100", :fps=&gt;"30", :qp=&gt;"30"}, {:bitrate=&gt;"500", :fps=&gt;"15", :qp=&gt;"20"}, {:bitrate=&gt;"500", :fps=&gt;"15", :qp=&gt;"30"}, {:bitrate=&gt;"500", :fps=&gt;"30", :qp=&gt;"20"}, {:bitrate=&gt;"500", :fps=&gt;"30", :qp=&gt;"30"}, {:bitrate=&gt;"1000", :fps=&gt;"15", :qp=&gt;"20"}, {:bitrate=&gt;"1000", :fps=&gt;"15", :qp=&gt;"30"}, {:bitrate=&gt;"1000", :fps=&gt;"30", :qp=&gt;"20"}, {:bitrate=&gt;"1000", :fps=&gt;"30", :qp=&gt;"30"}] </code></pre> <p>You can also add new key to your hash.</p> <pre><code>a = {} a[:bitrate] = ["100", "500", "1000"] a[:fps] = ["15", "30"] a[:qp] = ["20", "30"] a[:bw] = [true, false] product_hash(a) #=&gt; [{:bitrate=&gt;"100", :fps=&gt;"15", :qp=&gt;"20", :bw=&gt;true}, {:bitrate=&gt;"100", :fps=&gt;"15", :qp=&gt;"20", :bw=&gt;false}, {:bitrate=&gt;"100", :fps=&gt;"15", :qp=&gt;"30", :bw=&gt;true}, {:bitrate=&gt;"100", :fps=&gt;"15", :qp=&gt;"30", :bw=&gt;false}, {:bitrate=&gt;"100", :fps=&gt;"30", :qp=&gt;"20", :bw=&gt;true}, {:bitrate=&gt;"100", :fps=&gt;"30", :qp=&gt;"20", :bw=&gt;false}, {:bitrate=&gt;"100", :fps=&gt;"30", :qp=&gt;"30", :bw=&gt;true}, {:bitrate=&gt;"100", :fps=&gt;"30", :qp=&gt;"30", :bw=&gt;false}, {:bitrate=&gt;"500", :fps=&gt;"15", :qp=&gt;"20", :bw=&gt;true}, {:bitrate=&gt;"500", :fps=&gt;"15", :qp=&gt;"20", :bw=&gt;false}, {:bitrate=&gt;"500", :fps=&gt;"15", :qp=&gt;"30", :bw=&gt;true}, {:bitrate=&gt;"500", :fps=&gt;"15", :qp=&gt;"30", :bw=&gt;false}, {:bitrate=&gt;"500", :fps=&gt;"30", :qp=&gt;"20", :bw=&gt;true}, {:bitrate=&gt;"500", :fps=&gt;"30", :qp=&gt;"20", :bw=&gt;false}, {:bitrate=&gt;"500", :fps=&gt;"30", :qp=&gt;"30", :bw=&gt;true}, {:bitrate=&gt;"500", :fps=&gt;"30", :qp=&gt;"30", :bw=&gt;false}, {:bitrate=&gt;"1000", :fps=&gt;"15", :qp=&gt;"20", :bw=&gt;true}, {:bitrate=&gt;"1000", :fps=&gt;"15", :qp=&gt;"20", :bw=&gt;false}, {:bitrate=&gt;"1000", :fps=&gt;"15", :qp=&gt;"30", :bw=&gt;true}, {:bitrate=&gt;"1000", :fps=&gt;"15", :qp=&gt;"30", :bw=&gt;false}, {:bitrate=&gt;"1000", :fps=&gt;"30", :qp=&gt;"20", :bw=&gt;true}, {:bitrate=&gt;"1000", :fps=&gt;"30", :qp=&gt;"20", :bw=&gt;false}, {:bitrate=&gt;"1000", :fps=&gt;"30", :qp=&gt;"30", :bw=&gt;true}, {:bitrate=&gt;"1000", :fps=&gt;"30", :qp=&gt;"30", :bw=&gt;false}] </code></pre>
 

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