Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var obj = {};
    obj.foo = 1;
    obj.bar = "two";
    obj.baz = {};
    
    var dict = Object.create(null);
    dict.foo = 1;
    dict.bar = "two";
    dict.baz = {};
    
  };
</script>

Test runner

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var arr = [];

for (var prop in obj) {
  if (!obj.hasOwnProperty(prop)) { continue; }
  arr.push(obj[prop]);
}

var arr = [];

for (var prop in dict) {
  arr.push(dict[prop]);
}

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