AngularJS filtering object and modules. view here http://jsbin.com/acagag/4/edit. (SO 13887504)

app.js

angular.module('utils', [])
  .factory('utils', function(){
    return{
      compareStr: function(stra, strb){
        stra = ("" + stra).toLowerCase();
        strb = ("" + strb).toLowerCase();
        return stra.indexOf(strb) !== -1;
      }
    };
  });

angular.module('filters',['utils'])
  .filter('friendFilter', function(utils){
    
    return function(input, query){
      if(!query) return input;
      var result = [];
      
      angular.forEach(input, function(friend){
        if(utils.compareStr(friend.name, query) ||
           utils.compareStr(friend.phone, query))
          result.push(friend);          
      });
      return result;
    };
  });


angular.module('app',['filters'])
  .controller('HelloCntl', function($scope) {
    $scope.friends = {
        john: {
            name: 'John',
            phone: '555-1276'
        },
        mary: {
            name: 'Mary',
            phone: '800-BIG-MARY'
        },
        mike: {
            name: 'Mike',
            phone: '555-4321'
        },
        adam: {
            name: 'Adam',
            phone: '555-5678'
        },
        julie: {
            name: 'Julie',
            phone: '555-8765'
        }
    };  
  }); 

index.html

<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.min.js"></script>



<div ng-app='app'>
 <div ng-controller="HelloCntl">
  <input placeholder="Type to filter" ng-model="query">     
  <ul>
    <li ng-repeat="friend in friends | friendFilter:query">
    <span>{{friend.name}} @ {{friend.phone}}</span>
   </li>
  </ul>
 </div>
</div>