LICENSE

DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE Version 2, December 2004
(http://www.wtfpl.net/about/)
 
 Copyright (C) 2015 Ivan Fraixedes (https://ivan.fraixed.es)
 
 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.
 
 DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
 
 0. You just DO WHAT THE FUCK YOU WANT TO.

package.json

{
  "main": "perf-test.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "license": "WTFPL",
  "devDependencies": {
    "benchmark": "^2.1.0",
    "microtime": "^2.0.0"
  }
}

perf-test.js

'use strict';

let benchmark = require('benchmark');

let obj = {
  execFe: function(a, b, c) {
    return (function (a, b, c) {
      return (a + b) * c;
    }(a, b, c));
  },
  execAf: function(a, b, c) {
    return ((a, b, c) => (a + b) * c)(a, b, c);
  }
};

module.exports = obj;

let suite = new benchmark.Suite;

suite.add('arrow function', function () {
  obj.execAf(5, 10, 60);
})
.add('normal function', function () {
  obj.execFe(5, 10, 60);
})
.on('complete', function () {
  this.forEach(b => {
    console.log(`${b.name} -> mean: ${b.stats.mean}`);
  });

  let b = this[0];
  let m = this[1];
  let diff = b.stats.mean - m.stats.mean;
  console.log(`${b.name} is ${(diff < 0) ? 'faster' : 'slower'} than ${m.name} by ${(diff < 0) ? -diff : diff} seconds`);
  console.log(`Fastest is: ${this.filter('fastest').map('name')}`);
})
.run({ async: false });