requirebin sketch

index.js

var Benchmark = require('benchmark');
var suite = new Benchmark.Suite;

var totalPropertiesOnObjectWithProto = 0;
var totalPropertiesOnObjectWithoutProto = 0;

var hasPrototype = {};
addStuff(hasPrototype);

var noPrototype = Object.create(null);
addStuff(noPrototype);

suite.add('Run on object with prototype', function() {
  var count = 0;
  for (var k in hasPrototype) {
    if (hasPrototype.hasOwnProperty(k)) count += 1;
  }
  totalPropertiesOnObjectWithProto = count;
}).add('Run on object without prototype', function () {
  var count = 0;
  for (var k in noPrototype) {
    count += 1;
  }
  totalPropertiesOnObjectWithoutProto = count;
})
.on('cycle', function(event) {
  console.log(String(event.target));
})
.on('complete', function() {
  console.log('properties on object with prototype', totalPropertiesOnObjectWithProto);
  console.log('properties on object without prototype', totalPropertiesOnObjectWithoutProto);
  
  console.log('Fastest is ' + this.filter('fastest').pluck('name'));
})
// run async
.run({ 'async': true });

function addStuff(target) {
  for (var i = 0; i < 1000; ++i) {
    target['prop' + i] = i;
  }
}

minified.js

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