Filtering Object Array to only contain Key using Lodash
<p>I have the following object array:</p>

<pre><code> {
   running: false,
   swimming: false,
   drawing: true
  }
</code></pre>

<p>I want to filter the object array with only those that have false properties. From there I want to get only the keys of the array.</p>

<p>eg.</p>

<pre><code> [running, swimming]
</code></pre>

<p>I have the first part of removing values that have truth booleans through the following:</p>

<pre><code>var filtered = _.pick(hobbies, function(value, key) {return !value;});
</code></pre>

<p>What would be the best way to "flatten" the current array so that I only have the key values? </p>