gistfile1.js

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

// add tests
suite
.add('for', function() {
    const a = [1, 2, 3];
    const b = [4, 5, 6];

    // optimized for loop
    const len = b.length;
    for(let i = 0; i < len; i++) {
        a.push(b[i]);
    }
})
.add('forOf', function() {
    const a = [1, 2, 3];
    const b = [4, 5, 6];

    for(let val of b) {
        a.push(val);
    }
})
.add('pushApply', function() {
    const a = [1, 2, 3];
    const b = [4, 5, 6];

    Array.prototype.push.apply(a, b);
})
.add('pushSpread', function() {
    const a = [1, 2, 3];
    const b = [4, 5, 6];

    a.push(...b);
})
.add('concat', function() {
    const a = [1, 2, 3];
    const b = [4, 5, 6];

    const c = a.concat(b);
})
.on('cycle', function(event) {
    console.log(String(event.target));
})
.on('complete', function() {
    console.log('Fastest is ' + this.filter('fastest').map('name'));
})
.run({ 'async': true });