Here are 2 different ways to use the ng-class directive. I need them both, on the same element, but that doesn't work.

Using an object in ng-class

http://plnkr.co/edit/uZNK7I?p=preview

<div ng-repeat=item in [1, 2, 3, 4, 5] 

     ng-class={ first: $first, last: $last }>{{item}}</div>

correctly results in

<div class=first>1</div>

<div>2</div>

<div>3</div>

<div>4</div>

<div class=last>5</div>

Using an expression in ng-class

http://plnkr.co/edit/tp6lgR?p=preview

<div ng-repeat=item in [1, 2, 3, 4, 5] 

     ng-class= 'count-' + ($index + 1) >{{item}}</div>

correctly results in

<div class=count-1>1</div>

<div class=count-2>2</div>

<div class=count-3>3</div>

<div class=count-4>4</div>

<div class=count-5>5</div>

Now, how about use them together?

I need dynamic class names (like 'count-' + n), but also need the object syntax for multiple classes.

I can't just use 2 ng-class attributes (http://plnkr.co/edit/OLaYke?p=preview), only the first one works.

Any suggestions?