async mapping

async-mapping.js

async function waitForStuff(i) {
  return new Promise((resolve) => {
    setTimeout(() => resolve(`yay!`), 100)
  })
}

async function main() {
  const mapped = Promise.all([1,2,3,4].map(async (item) => {
    const res = await waitForStuff()
    return res
  }))
  return mapped
}

async function other() {
  return Promise.all([1,2,3,4].map(waitForStuff))
}

main().then(mapped => console.log('finished', mapped))
other().then(mapped => console.log('finished', mapped))