StackOverflow2013

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PO
primarykey
Id
9787079
data
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0
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0
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2
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2012-03-20T12:49:55.730
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2012-03-20T12:49:55.730
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298624
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9786264
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2
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27
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text
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<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=>"100", :fps=>"15", :qp=>"20"}, {:bitrate=>"100", :fps=>"15", :qp=>"30"}, {:bitrate=>"100", :fps=>"30", :qp=>"20"}, {:bitrate=>"100", :fps=>"30", :qp=>"30"}, {:bitrate=>"500", :fps=>"15", :qp=>"20"}, {:bitrate=>"500", :fps=>"15", :qp=>"30"}, {:bitrate=>"500", :fps=>"30", :qp=>"20"}, {:bitrate=>"500", :fps=>"30", :qp=>"30"}, {:bitrate=>"1000", :fps=>"15", :qp=>"20"}, {:bitrate=>"1000", :fps=>"15", :qp=>"30"}, {:bitrate=>"1000", :fps=>"30", :qp=>"20"}, {:bitrate=>"1000", :fps=>"30", :qp=>"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) #=> [{:bitrate=>"100", :fps=>"15", :qp=>"20", :bw=>true}, {:bitrate=>"100", :fps=>"15", :qp=>"20", :bw=>false}, {:bitrate=>"100", :fps=>"15", :qp=>"30", :bw=>true}, {:bitrate=>"100", :fps=>"15", :qp=>"30", :bw=>false}, {:bitrate=>"100", :fps=>"30", :qp=>"20", :bw=>true}, {:bitrate=>"100", :fps=>"30", :qp=>"20", :bw=>false}, {:bitrate=>"100", :fps=>"30", :qp=>"30", :bw=>true}, {:bitrate=>"100", :fps=>"30", :qp=>"30", :bw=>false}, {:bitrate=>"500", :fps=>"15", :qp=>"20", :bw=>true}, {:bitrate=>"500", :fps=>"15", :qp=>"20", :bw=>false}, {:bitrate=>"500", :fps=>"15", :qp=>"30", :bw=>true}, {:bitrate=>"500", :fps=>"15", :qp=>"30", :bw=>false}, {:bitrate=>"500", :fps=>"30", :qp=>"20", :bw=>true}, {:bitrate=>"500", :fps=>"30", :qp=>"20", :bw=>false}, {:bitrate=>"500", :fps=>"30", :qp=>"30", :bw=>true}, {:bitrate=>"500", :fps=>"30", :qp=>"30", :bw=>false}, {:bitrate=>"1000", :fps=>"15", :qp=>"20", :bw=>true}, {:bitrate=>"1000", :fps=>"15", :qp=>"20", :bw=>false}, {:bitrate=>"1000", :fps=>"15", :qp=>"30", :bw=>true}, {:bitrate=>"1000", :fps=>"15", :qp=>"30", :bw=>false}, {:bitrate=>"1000", :fps=>"30", :qp=>"20", :bw=>true}, {:bitrate=>"1000", :fps=>"30", :qp=>"20", :bw=>false}, {:bitrate=>"1000", :fps=>"30", :qp=>"30", :bw=>true}, {:bitrate=>"1000", :fps=>"30", :qp=>"30", :bw=>false}] </code></pre>
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