await + async + generator + destruct + iterable

gistfile1.txt

async function f(e) {
  var p = new Promise((r) => {
    setTimeout(() => {r(e)}, 1000);
  })
  return p;
}

function* makeSimpleGenerator(array){
    var nextIndex = 0;
    while(nextIndex < array.length){
        yield f(array[nextIndex++]);
    }
}

var gen = makeSimpleGenerator([['a', 101], ['b', 102], ['c', 103], ['d', 104]]);

async function g() {
  for(var e of gen) {
    var [id, num] = await e;
    console.log('<<>>', id, '--->', num);
  }
}

g();