Async Generators

index.js

async function * generateInput() {
  yield 1;
  yield 2;
  yield 3;
}

async function * addOne (input) {
  for await (const value of input) {
    yield value + 1;
  }
}

async function * timesTwo(input) {
  for await (const value of input) {
    yield value * 2;
  }
}

async function main() {
  const input =  generateInput();

  for await (const n of addOne(timesTwo(input))) {
    console.log(n);
  }
}

main().catch(console.error);