async_generator example

async_generator.js

var Promise = require('promise');

function* counter(){
  let i=0;
  while(1){
    yield i++;
  }
}

function wait(time){
  return new Promise(function(done){
    setTimeout(done,time);
  });
}

async function* delay(){
  for(const x of this){
    await wait(1000);
    yield x; 
  }
}

async function logAsyncCount1(){
  var x = delay.call(counter());
  console.log('start');
  while(1){
    var obj=await x.next();
    if(obj.done) return;
    console.log(obj.value);
  }
  console.log('end');
}


async function logAsyncCount2(){
  var it = delay.call(counter());
  console.log('start');
  for(var y of it()){
    console.log(y);
  }
  console.log('end');
}

logAsyncCount1();

npm install promise
npm install -g regenerator
regenerator -r async_generator.js | node