How to destroy an angularjs app?

Using AngularJS 1.4.0, $rootScope.$destroy() is working again (as it was broken in 1.2). Using this permits to switch between several angularJS apps:

var appManager = new function () {
    this.currentAppName;
    this.currentApp;

    this.startApp = function (appContainerId, appName) {
        if (this.currentApp) {
            this.destroyApp(this.currentApp, this.currentAppName);
        }
        var appContainer = document.getElementById(appContainerId);
        if (appContainer) {
            this.currentAppName = appName;
            this.currentApp = angular.bootstrap(appContainer, [appName]);
        }
    }

    this.destroyApp = function (app, appName) {
        var $rootScope = app.get('$rootScope');
        $rootScope.$destroy();
    }
}

// Call this when page is ready to rebootsrap app
appManager.startApp('divContainerId', 'app');