Array for-loop and Array.forEach

index.js

'use strict';
var Benchmark = require('benchmark');

var suite = new Benchmark.Suite;

var forLoop = {
  setup: () => {
    var arr = [];
    for (var i = 0; i < 1000; i++) {
      arr[i] = i;
    }
    this.arr = arr;
  },
  fn: () => {
    function someFn(i) {
      return i * 3 * 8;
    }
    var arr = this.arr;
    for (var i = 0, len = arr.length; i < len; i++) {
      someFn(arr[i]);
    }
  }
};

var forEach = {
  setup: () => {
    var arr = [];
    for (var i = 0; i < 1000; i++) {
      arr[i] = i;
    }
    this.arr = arr;
  },
  fn: () => {
    this.arr.forEach(i => i * 3 * 8);
  }
};

// add tests
suite
  .add('for loop', forLoop)
  .add('for each', forEach)
  .on('cycle', function(event) {
    console.log(String(event.target));
  })
  .on('complete', function() {
    console.log('Fastest is ' + this.filter('fastest').map('name'));
  })
  .run({ 'async': true });