Question

A version of Sequence#contains which returns an AsyncHandle.

Signature

AsyncSequence.contains = function(value) { /*...*/ }

AsyncSequence.contains = function contains(value) {
  var found = false;

  var handle = this.each(function(e) {
if (e === value) {
  found = true;
  return false;
}
  });

  return handle.then(function() {
return found;
  });
}

Name	Type(s)	Description
value	*	The element to search for in the sequence.
returns	AsyncHandle	An AsyncHandle (promise) which resolves to either true or false to indicate whether the element was found.