asyncawait-vs-yield.js

const co = require('co');
const Benchmark = require('benchmark');

function asyncOp () {
    return new Promise((fulfill, reject) => {
        fulfill('ok');
    });
}

function yieldAction () {
    return new Promise((fulfill, reject) => {
        co(function *() {
            const result = yield asyncOp();
            fulfill(result);
        }).catch(function (err) {
            console.log(err)
        });
    });
}

function asyncAction () {
    return new Promise(async (fulfill, reject) => {
        try {
            var result = await asyncOp();
            fulfill(result);
        } catch (err) {
            console.log(err);
        }
    });
}

const suite = new Benchmark.Suite;

suite.add('yieldAction#test', () => {
    return yieldAction();
}).add('asyncAction#test', () => {
    return asyncAction();
}).on('cycle', function(event) {
  console.log(String(event.target));
}).on('complete', function() {
  console.log('Fastest is ' + this.filter('fastest').map('name'));
}).run({ 'async': true });