Angular, quick booleans in templates

quickbooleans.js

//
// Problem: In Angular, you're using directives in the HTML to reference properties on the scope,
// but you end up with super long expressions in your html like ...
//
// ng-if="myCity.publicZoo.myEscapedAnimal.type === animals.mammals.primates.orangutan"
//
// and you end up exposing constants to the scope so you can do those checks
//
// $scope.animals = Animals
//
// I prefer to something like this ng-if="is('orangutan')"

var is = {
  'orangutan': function(){
    return $scope.myCity.publicZoo.myEscapedAnimal.type === Animals.mammals.primates.orangutan;
  }
};
$scope.is = function(key){
  return _.result(is, key);
};

// Thoughts?