JSFiddle - React, Tailwind, and code Playground
HTML
<div ng-app ng-controller="Ctrl">
<div ng-repeat="item in items" ng-class="{left:$index%3==0,middle:$index%3==1,right:$index%3==2}">
{{item.id}}
</div>
</div>
JavaScript
function Ctrl($scope){
$scope.items=[{id:1},{id:2},{id:3},{id:4},{id:5},{id:6}];
}