Question

An asynchronous version of Sequence#each.

Signature

AsyncSequence.each = function(fn) { /*...*/ }

AsyncSequence.each = function each(fn) {
  var iterator = this.parent.getIterator(),
  onNextCallback = this.onNextCallback,
  cancelCallback = this.cancelCallback,
  i = 0;

  var handle = new AsyncHandle(function cancel() {
if (cancellationId) {
  cancelCallback(cancellationId);
}
  });

  var cancellationId = onNextCallback(function iterate() {
cancellationId = null;

try {
  if (iterator.moveNext() && fn(iterator.current(), i++) !== false) {
    cancellationId = onNextCallback(iterate);

  } else {
    handle._resolve();
  }

} catch (e) {
  handle._reject(e);
}
  });

  return handle;
}

Name	Type(s)	Description
fn	Function	The function to invoke asynchronously on each element in the sequence one by one.
returns	AsyncHandle	An AsyncHandle providing the ability to cancel the asynchronous iteration (by calling cancel()) as well as supply callback(s) for when an error is encountered (onError) or when iteration is complete (onComplete).