Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    function preventDefault() {
        this._isDefaultPrevented = true;
    }
    
    function isDefaultPrevented() {
        return this._isDefaultPrevented;
    }
    
    eventPrototype = {
      preventDefault: preventDefault,
      isDefaultPrevented: isDefaultPrevented
    }
    
    function triggerProto(e) {
        e = e || {};
        e.__proto__= eventPrototype;
        e.preventDefault();
    }
    function triggerObject(e) {
        e = e || {};
        e.preventDefault = preventDefault;
        e.isDefaultPrevented = isDefaultPrevented;
        e.preventDefault();
    }
  };
</script>

Test runner

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triggerObject({ field: "foo" });

triggerProto({ field: "foo" });

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