eventemitter.js

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

var Heatup = require('events').EventEmitter;
var heatup = new Heatup;

var EventEmitter = require('events').EventEmitter;
var emitter = new EventEmitter;

var EventEmitter2 = require('eventemitter2');
var emitter2 = new EventEmitter2;

var EventEmitter3 = require('eventemitter3');
var emitter3 = new EventEmitter3;

var EventEmitter4 = require('eventemitter4');
var emitter4 = new EventEmitter4;

var EventEmitter5 = require('fast-event-emitter');
var emitter5 = new EventEmitter5;

Benchmark.prototype.setup(function() {
  var count = [0, 0, 0, 0, 0, 0];
});

suite

  .add('EventEmitterHeatUp', function() {

      heatup.on('heatup', function () {
        heatup.removeAllListeners('heatup');
        return new Date();
      });
      heatup.emit('heatup');

  })

  .add('EventEmitter', function() {

    emitter.on('test1', function () {
      emitter.removeAllListeners('test1');
      return new Date();
    });
    emitter.emit('test1');

  })
  .add('EventEmitter2', function() {

    emitter2.on('test2', function () {
      emitter2.removeAllListeners('test2');
      return new Date();
    });
    emitter2.emit('test2');

  })

  .add('EventEmitter3', function() {

    emitter3.on('test3', function () {
      emitter3.removeAllListeners('test3');
      return new Date();
    });
    emitter3.emit('test3');

  })

  .add('EventEmitter4', function() {

    emitter4.on('test4', function () {
      emitter4.removeAllListeners('test4');
      return new Date();
    });
    emitter4.emit('test4');

  })

  .add('EventEmitter5', function() {

    emitter5.on('test5', function () {
      emitter5.removeAllListeners('test5');
      return new Date();
    });
    emitter5.emit('test5');

  })

  .on('cycle', function(event, bench) {
    console.log(String(event.target));
  })

  .on('complete', function() {
    console.log('\nFastest is ' + this.filter('fastest').map('name'));
  })

  .run({async: false});

// EventEmitterHeatUp x 1,854,119 ops/sec ±3.33% (81 runs sampled)
// EventEmitter x 1,941,173 ops/sec ±2.13% (80 runs sampled)
// EventEmitter2 x 3,324,465 ops/sec ±2.08% (84 runs sampled)
// EventEmitter3 x 1,239,810 ops/sec ±1.57% (85 runs sampled)
// EventEmitter4 x 236,741 ops/sec ±1.42% (92 runs sampled)
// EventEmitter5 x 3,572,485 ops/sec ±1.81% (87 runs sampled)

// Fastest is EventEmitter5