Mas antes disso, controlar código assíncrono era bem mais complexo e difícil.

Nas versões anteriores do Python, você poderia utilizar threads ou <a href="https://www.gevent.org/" class="external-link" target="_blank">Gevent</a>. Mas o código é bem mais complexo de entender, debugar, e pensar sobre.

Nas versões anteriores do NodeJS / Navegador JavaScript, você utilizaria "callbacks". O que leva ao "inferno do callback".

    public boolean contains(@Nullable Object element) {
      return multimap.containsKey(element);
    }

    @Override
    public Iterator<K> iterator() {
      return Maps.keyIterator(multimap.entries().iterator());
    }

    @Override
    public int count(@Nullable Object element) {
      Collection<V> values = Maps.safeGet(multimap.asMap(), element);
      return (values == null) ? 0 : values.size();

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        .createTestSuite();
  }

  // Not specifying KNOWN_ORDER for PriorityQueue and PriorityBlockingQueue
  // even though they do have it, because our tests interpret KNOWN_ORDER to
  // also mean that the iterator returns the head element first, which those
  // don't.

  public Test testsForPriorityBlockingQueue() {
    return QueueTestSuiteBuilder.using(

        try {
            // Convert RPC message to WitnessNotification
            WitnessNotification notification = new WitnessNotification();

            // Set event type based on message type
            WitnessEventType eventType = convertMessageTypeToEventType(message.getType());
            notification.setEventType(eventType);
            notification.setTimestamp(message.getTimestamp());

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