async-await.js

'use strict';

/**
 * node --harmony-async-await --trace-opt --trace-deopt test.js | grep 'disabled'
 */

const REJECT_PROBABILITY = 5 / 10000;

const resolveAfterTimeout = (timeout) => {
    return new Promise((resolve, reject) => {
        if (Math.random() < REJECT_PROBABILITY) {
            setTimeout(reject, timeout, new Error(`Error at ${timeout}`));
        } else {
            setTimeout(resolve, timeout);
        }
    });
}

const noop = (err) => {
    
}

const mainWithAsync = async () => {
    const promises = [];

    for (let i = 0; i < 100; i++) {
        promises.push(resolveAfterTimeout(i));
    }

    try {
        await Promise.all(promises);
    } catch (err) {
        noop(err);
    }
}

const mainWithoutAsync = () => {
    const promises = [];

    for (let i = 0; i < 100; i++) {
        promises.push(resolveAfterTimeout(i));
    }

    Promise.all(promises).catch(noop);
}

mainWithAsync();
// mainWithoutAsync();