Preparation code

<div id="whut">dunno</div>
<script>
  Benchmark.prototype.setup = function() {
    var cacheArray = {};
    cacheArray['whut'] = document.getElementById('whut');
    
    
  };
</script>

Preparation code output

Test runner

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var theItem = document.getElementById('whut');

var theItem = cacheArray['whut'];

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