title: Create the objectIds map with variable keys for a DuplicateObject request
body: <p>When creating a "duplicate object" request, the <code>objectIds</code> map will not let me put a variable in the <strong>emphasized</strong> portion below:</p>
  
  <pre><code>var alternateSlideId = 'alternate_' + i;
  { 
      duplicateObject:
      {
          objectId: alternateSlide,
          objectIds: {
              **alternateSlide**: 'Copied_Alternate_Slide_' + i,
          }
      }
  }
  </code></pre>
  
  <p>(i is a number in a loop)
  From my understanding the map function works like<br>
      <code>((objectId to be copied) : (name of new objectId))</code><br>
  I'm unable to use a variable on the left side of the map function, and I'm unable to put <code>'alternate_' + i</code> into the left side of the map and I'm uncertain as to why. I need to duplicate multiple slides that have already been duplicated before, and thus have variable names.</p>
  
  <p>How can I assign variable keys to the <code>objectIds</code> map?</p>