AngularJS doesn't include a unique
filter by default. You can use the one from angular-filter. Just include the JavaScript
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular-filter/0.5.8/angular-filter.min.js"></script>
and include the dependeny in your app:
var app = angular.module('myApp', ['angular.filter']);
Your code should work right away! I edited your Plunker so it works.
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