Tiny example of async generator functions

async-generator.js

let timer = (ms) => new Promise(resolve => setTimeout(resolve, ms));

let producer = async function*() {
  let counter = 0;
  while (true) {
    let delay = Math.random() * 1000;
    await timer(delay);
    yield counter++;
  }
};

let consumer = async (source) => {
  for await (let value of source) {
    console.log(value);
  }
};

consumer(producer());