async function* users(from, to) {
  for (let i = from; i <= to; i++) {
    const res = await fetch('https://jsonplaceholder.typicode.com/users/' + i);
    const json = await res.json();
    yield json;
  }
}

// Map operator for AsyncIterables
async function* map(inputAsyncIter, f) {
  for await (let x of inputAsyncIter) {
    yield f(x);
  }
}

async function main() {
  const allUsers = users(1, 10);
  // Pass `allUsers` around, create a new  `names`
  const names = map(allUsers, user => user.name);
  for await (let name of names) {
    console.log(name);
  }
}

main();