promiseParallel.js

function promiseWait(timeToWait, startTime) {
    return new Promise((resolve, reject) => {
        setTimeout(() => {
            resolve(new Date().getTime() - startTime);
        }, timeToWait);
    });
}

async function waitChainPromiseAll() {
	const startTime = new Date().getTime();
	let obj = {};
	let promises = [];
	promises.push(promiseWait(100, startTime).then(res => obj["a"] = res))
	promises.push(promiseWait(100, startTime).then(res => obj["b"] = res))

	await Promise.all(promises)
	console.log("waitChainPromiseAll", obj)
}

// waitChainPromiseAll { a: 105, b: 105 }