title: Remove element from an array of arrays
body: <p>I want to delete an element that in this case is an array within another array</p>
  
  <pre><code>arr = [['a','b'],['c','d'],['e','f']];
  tag = ['c','d'];
  </code></pre>
  
  <p>I want to remove tag from arr, and for that I'm trying to do this:</p>
  
  <pre><code>arr.splice(arr.indexOf(tag), 1);
  </code></pre>
  
  <p>But I do not know why it does not work, How could I do this?</p>