bench.js

const bench = require('benchmark');

module.exports = (test, ...functions) => {
	const suite = new bench.Suite();
	for (const func of functions) {
		suite.add(func.name, test.bind(null, func));
	}
	return suite
		.on('start', () => console.log('Starting benchmark...'))
		.on('cycle', (event) => {
			console.log(String(event.target));
		}).on('complete', function () {
			console.log('Fastest is ' + this.filter('fastest').map('name'));
		}).run({ 'async': true });
}

reverseStringExample.js

function reverseString(text) {
	return text.split("").reverse().join("");
}

function reverseStringForLoop(text) {
	let result = "";
	for (let i = text.length - 1; i >= 0; i--) {
		result += text[i];
	}
	return result;
}

require('./bench.js')((func) => {
	func('aeiou');
	func('123456789');
	func('AsDfGhJkL');
}, reverseString, reverseStringForLoop);
/*
Starting benchmark...
reverseString x 643,832 ops/sec ±2.94% (81 runs sampled)
reverseStringForLoop x 1,805,835 ops/sec ±1.54% (87 runs sampled)
Fastest is reverseStringForLoop
*/