Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var o = {}
    
    for (var i = 0; i < 5000; i++) {
      o[Math.floor(Math.random() * 50000).toString()] = 1
    }
  };
</script>

Test runner

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var rand = Math.floor(Math.random() * 50000).toString()

if (o[rand]) {
  console.log('found')
}
 

var rand = Math.floor(Math.random() * 50000).toString()

if (Object.prototype.hasOwnProperty.call(o, rand)) {
  console.log('found')
}

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