title: how to pop multiple list at a time in Redis
body: <p>I am using <strong>node_redis</strong>. I want to pop elements from multiple list at a time.<br>
  Here is my code. </p>
  
  <pre><code>setInterval(function () {
      redisClient.rpop('qwerty123', function (errorMessage, responseData) {
          socketData.emit('qwerty123', {
              'qwerty123': responseData.toString()
          });
          });
      redisClient.rpop('qwerty234', function (errorMessage, responseData) {
          socketData.emit('qwerty234', {
              'qwerty234': responseData.toString()
          });});
      redisClient.rpop('qwerty345', function (errorMessage, responseData) {
          socketData.emit('qwerty345', {
              'qwerty345': responseData.toString()
      });});
  }, 1000);
  </code></pre>
  
  <p>It process lists one by one but I want to pop from all three list at same time. </p>