title: Summing a column in a table in Meteor
body: <p>If I create a table in a Template, is there a way to add a row of "reactive totals" at the bottom of the table using Meteor?  Or do I have to write the code to sum the columns, the same way I would in ordinary JavaScript?</p>
  
  <p>For example, given the table...</p>
  
  <pre><code>State   Sales
  NY      1234
  FL       670
  TX      2306
  Total   4210
  </code></pre>
  
  <p>Can I use some reactive technique to calculate and keep the Total cell showing <code>4210</code> up-to-date as other cells change?</p>