Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    function doStuff(a) {
      return Math.log(a) + Math.sin(a) + Math.pow(a, 3) + Math.sqrt(a);
    }
    
    var out = {};
    
    function thingSE(a, out) {
      out.x = doStuff(a);
    }
    
    function thing(a) {
      thing.x = doStuff(a);
    }
  };
</script>

Test runner

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thingSE(Math.random(), out);
var b = out.x;

thing(Math.random());
var b = thing.x;

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