map sorting

var Benchmark = require('benchmark');
var expect = require('expect');
var _ = require('lodash');
var R = require('ramda');
var suite = new Benchmark.Suite;

var testArray = [1,2,3,4,5,6,7,8,9,10,11,12,13];
var resultat = [2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26];

suite
    .add('For', () => forTest(testArray))
    .add('map native', () => mapNativeTest(testArray))
    .add('map lodash', () => mapLodashTest(testArray))
    .add('map ramda', () => mapRamdaTest(testArray))
    .on('cycle', event => console.log(String(event.target)))
    .on('complete', function() {console.log('Fastest is ' + this.filter('fastest').map('name'))})
    .run({ 'async': true });

function forTest(array) {
    var length = array.length,
        result = Array(length),
        i = 0;

    for(; i < length; i++) {
        result[i] = array[i] * 2;
    }

    return result;
}

function mapNativeTest(arr) {
    return arr.map(function(item) {return item * 2})
}

function mapLodashTest(arr) {
    return _.map(arr, function(item) {return item * 2})
}

function mapRamdaTest(arr) {
    return R.map(function(item) {return item * 2}, arr)
}

expect(forTest(testArray)).toEqual(resultat);
expect(mapNativeTest(testArray)).toEqual(resultat);
expect(mapLodashTest(testArray)).toEqual(resultat);
expect(mapRamdaTest(testArray)).toEqual(resultat);