title: Concatenate Object values
body: <p>I have a JavaScript Object and I'm sure the value of any key is an array (even empty in some case):</p>
  
  <pre><code>{key1:["a","b","c"],key2:["d","e","f"],key3:...}
  </code></pre>
  
  <p>Aside from using Underscore, is there any way to concatenate all the values of this Object (and create a new array)?</p>
  
  <p>At the moment I get the keys name using <code>Object.keys</code>, then I loop and concatenate.</p>
  
  <p>Any help is appreciated.</p>