AngularJS - Extract Scopes

var scopeElements = Array.prototype.slice.apply(document.querySelectorAll(".ng-scope"));
var scopes = scopeElements.map(function (element) {
    return angular.element(element).scope();
});
var scopeIds = scopes.map(function(scope) {
    return scope.$id;
});
var uniqueScopeIds = scopeIds.filter(function(scopeId, index){
    return scopeIds.indexOf(scopeId) === index;
});