Benchmarking how much faster it is to null a property of an object versus deleting that property in JavaScript

benchmark-object-delete-vs-assign.js

var Benchmark = require('benchmark');

function complete() {
  console.log(String(this));
}

var objDeleteBenchmark = new Benchmark('Object#delete-property', {
  setup: function() { var obj = {foo: 'bar'}; },
  fn: function() { delete obj.foo; }
});

var nullPropertyBenchmark = new Benchmark('Object#null-property', {
  setup: function() { var obj = {foo: 'bar'}; },
  fn: function() { obj.foo = null; }
});

objDeleteBenchmark.run({ 'async': true }).on('complete', complete);
nullPropertyBenchmark.run({ 'async': true }).on('complete', complete);

Same test using a more complex object

Good job