every method

Future<bool> every (bool test(T element))

Checks whether test accepts all elements provided by this stream.

Calls test on each element of the stream. If the call returns false, the returned future is completed with false and processing stops.

If the stream ends without finding an element that test rejects, the returned future is completed with true.

If this stream contains an error, or if the call to test throws, the returned future is completed with that error, and processing stops.

Implementation 

Future<bool> every(bool test(T element)) {
  _Future<bool> future = new _Future<bool>();
  StreamSubscription subscription;
  subscription = this.listen(
      (T element) {
        _runUserCode(() => test(element), (bool isMatch) {
          if (!isMatch) {
            _cancelAndValue(subscription, future, false);
          }
        }, _cancelAndErrorClosure(subscription, future));
      },
      onError: future._completeError,
      onDone: () {
        future._complete(true);
      },
      cancelOnError: true);
  return future;
}