Set Member group ID variable in template using JavaScript

Sometimes you might want to control something based on member groups. One way to do this is to set a variable using JavaScript:

In a template to use just the primary group:

<script>
  var groupId = {expression="\IPS\Member::loggedIn()->member_group_id"};
</script>

or for all group ids (comma-separated):

<script>
  var groupIds = "{expression="implode( ',', \IPS\Member::loggedIn()->groups )"}";
</script>