es-promisify benchmark

benchmark.js

const num = process.argv[2]
const promisify = require('es6-promisify');

function someFunction(callback) {
	process.nextTick(callback.bind(null, null, new Date()));
}

async function loop(call) {
	for (let i = 0; i < num; i+= 1) {
		await call()
	}
}

async function testPromise() {
	await loop(function () {
		return new Promise(function (resolve, reject) {
			someFunction(function (error, data) {
				if (error) {
					reject(error);
					return;
				}

				resolve(data);
			})
		})
	})
}

async function testEsPromisify() {
	await loop(function () {
		return promisify(someFunction)();
	})
}

async function time(label, call) {
	console.time(label)
	await call()
	console.timeEnd(label)
}

async function run() {
	while (true) {
		await time('promise', testPromise)
		await time('es-promisify', testEsPromisify)
	}
}

run()