Parallel and sequential async processing

async.js

const randomTimeout = () => Math.floor(Math.random() * (3000 - 500)) + 500

const someAsyncProcess = message => new Promise(resolve => setTimeout(() => {
  console.log(message)
  resolve()
}, randomTimeout()))

const messages = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

const testParallel = async () => Promise.all(messages.map(async message => someAsyncProcess(message)))

const testSequential = async () => messages.reduce(async (previousPromise, message) => {
  await previousPromise
  return someAsyncProcess(message)
}, Promise.resolve())

const test = async () => {
  console.log('Parallel run')
  await testParallel()
  console.log('--------------')
  console.log('Sequantial run')
  await testSequential()
}

test()

Hoi René,

Even voor mijn duidelijkheid:

const testParallel = ASYNC () => Promise.all(messages.map(ASYNC message => someAsyncProcess(message)))
const testSequential = ASYNC () => messages.reduce(async (previousPromise, message) => {

Volgens mijn zijn de async-en niet nodig op regels 10 en 12 omdat jij binnen die functies geen await hebt gebruikt.

Klopt het?