title: Insert array into redis from NodeJS
body: <p>I have an array which I fill up in a for like this:</p>
  
  <pre><code>var obj = [];
  for(i = 0; i &lt; data.bids.length; i += 1) {
      obj.push(JSON.parse(data.bids[i][0]));
  }
  </code></pre>
  
  <p>After that I verify if the array contains the desired values (it contains):</p>
  
  <pre><code>console.log("Array after the for: \n");
  console.log(obj);
  </code></pre>
  
  <p>I try to save this under a redis key, but the <code>reply</code> is <code>undefined</code></p>
  
  <pre><code>client.set('order-book:buy:bitstamp', obj, function(err, reply) {
      console.log(reply);
  });
  </code></pre>
  
  <p>I've also tried with <code>rpush</code>, but no luck.<br>
  What could be the problem?</p>