title: FAST Element's Repeat Directive - Indexing
body: <p>Hello FAST team/community members!</p>
  <p>I am currently building out a project using FAST Element, web components, and Fluent-UI. I am trying to render something based on where two items are in an array.</p>
  <p>I noticed that under the repeat directive there is an index property which will give the index of the current item inside a repeat block.</p>
  <p>Is it possible to use the index property of repeat to also look ahead in the array?</p>
  <p>Ex. if the current item is null, would it be possible to check index + 1 to see if the next item is null as well? Or would this have to be done outside of the repeat block with a check?</p>
  <p>Thank you!</p>