AngularJS : Custom filters and ng-repeat -

i'm angularjs newbie , i'm building small proof-of-concept car hire listings app pulls in json , renders out various bits of data via ng-repeat, couple of filters:

   <article data-ng-repeat="result in results | filter:search" class="result">         <header><h3>{{result.cartype.name}}, {{result.cardetails.doors}} door, &pound;{{result.price.value}} - {{ result.company.name }}</h3></header>             <ul class="result-features">                 <li>{{result.cardetails.hireduration}} day hire</li>                 <li data-ng-show="result.cardetails.aircon">air conditioning</li>                 <li data-ng-show="result.cardetails.unlimitedmileage">unlimited mileage</li>                 <li data-ng-show="result.cardetails.theftprotection">theft protection</li>             </ul>     </article>      <h2>filters</h2>      <h4>doors:</h4>      <select data-ng-model="search.cardetails">         <option value="">all</option>         <option value="2">2</option>         <option value="4">4</option>         <option value="9">9</option>     </select>      <h4>provider:</h4>     atlas choice <input type="checkbox"  data-ng-model="search.company" ng-true-value="atlas choice" ng-false-value="" value="atlas choice" /><br>     holiday autos <input type="checkbox"  data-ng-model="search.company" ng-true-value="holiday autos" ng-false-value="" value="holiday autos" /><br>     avis <input type="checkbox"  data-ng-model="search.company" ng-true-value="avis" ng-false-value="" value="avis" /><br>       

now want create custom filter in controller, can iterate on items in ng-repeat , return items meet criteria - example, might create array of values based on 'provider' checkboxes checked, evaluate each ng-repeat item against that. can't work out how i'd though, in terms of syntax - can help?

here's plunker: http://plnkr.co/edit/lnjnyagmc2rszbsof95k?p=preview

if want run custom filter logic can create function takes array element argument , returns true or false based on whether should in search results. pass filter instruction search object, example:

js:

$scope.filterfn = function(car) {     // tests      if(car.cardetails.doors > 2)     {         return true; // listed in results     }      return false; // otherwise won't within results }; 

html:

... <article data-ng-repeat="result in results | filter:search | filter:filterfn" class="result"> ... 

as can see can chain many filters together, adding custom filter function doesn't force remove previous filter using search object (they work seamlessly).