Creating empty objects in different ways and checking execution time, heap size etc.

ObjectCreationPerformance.js

/**
 * Creating empty objects in different ways and checking execution time, heap size etc.
 */
 
// Property-less object 
console.time('zoop');
var zoop = (function (numObjects) {
  var pooz = Object.create(null);
  for(var i = 0; i< numObjects; i++) {
    pooz[i] = Object.create(null);
  }
  return pooz;
})(1000000);
console.timeEnd('zoop');

// Using Object Literal
console.time('zoop');
var zoop = (function (numObjects) {
  var pooz = {};
  for(var i = 0; i< numObjects; i++) {
    pooz[i] = {};
  }
  return pooz;
})(1000000);
console.timeEnd('zoop');

// Object.create({})
console.time('zoop');
var zoop = (function (numObjects) {
  var pooz = Object.create({});
  for(var i = 0; i< numObjects; i++) {
    pooz[i] = Object.create({});
  }
  return pooz;
})(1000000);
console.timeEnd('zoop');

// new Object
console.time('zoop');
var zoop = (function (numObjects) {
  var pooz = new Object();
  for(var i = 0; i< numObjects; i++) {
    pooz[i] = new Object();
  }
  return pooz;
})(1000000);
console.timeEnd('zoop');