A tiny generator helper for consuming callback code directly

run.js

function run(generator) {
  var iterator = generator(resume);
  var data = null, yielded = false;
  
  iterator.next();
  yielded = true;
  check();
  
  function check() {
    while (data && yielded) {
      var err = data[0], item = data[1];
      data = null;
      yielded = false;
      if (err) return iterator.throw(err);
      iterator.send(item);
      yielded = true;
    }
  }
  
  function resume() {
    data = arguments;
    check();
  }
}

I know this is super old but to anyone looking into generators now, iterator.send(item) should now be iterator.next(item).