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app.filter('filterName', function () {
  return function (items, argument) {
    var filtered = [];
    for (var i = 0; i < items.length; i++) {
      var item = items[i];
      // Condition to filter an array.
      // Can have any code.
      if (item.argument) {
        filtered.push(item);
      }
    }
    return filtered;
  };
});

// Sample of implementation:
//<li ng-repeat="friend in person.friends | filterName:argument">
  //  {{ friend }}
//</li>