<div ng-app="H2G2">
    <div ng-controller="DeepThoughtController">
        <a href ng-click="reset()">reset</a>
        <a href ng-click="compute(6,9)">compute</a> {{response}}
    </div>
</div>
<script>
    angular.module('H2G2',['DeepThought']);
    angular.module('DeepThought', []).factory('deepThought', function() {
        var deepThought = {};
        deepThought.compute = function(param) {...}
        return deepThought;
    });
    var DeepThoughtController = function($scope, deepThought) {
        $scope.reset = function () { $scope.response = "DeepThought~> ZzzZz...";}
        $scope.reset();
        $scope.compute = function(param1, param2) {
            $scope.response = "La réponse est " + deepThought.compute(param1 * param2);
        };
    };
</script>