angularJs watchers

// from: https://angularjs.de/artikel/angularjs-access-scope-via-console
// bug fixed

// fetch all elements with ng-scope class
var scopeElements = Array.prototype.slice.apply(document.querySelectorAll(".ng-scope"));
// map elements to scopes
var scopes = scopeElements.map(function (element) {
    return angular.element(element).scope();
});
// filter duplicated scopes created by ng-view
var scopesById = {};
var uniqueScopes = [];
scopes.forEach(function (scope) {
    if (scopesById[scope.$id] === undefined) {
        scopesById[scope.$id] = scope;
        uniqueScopes.push(scope);
    }
});
// map uniqueScopes to watchers
var watchers = uniqueScopes.map(function (scope) {
    return scope.$$watchers;
});
// extract the length
var watchersLengths = watchers.map(function (watcher) {
    return watchers.length;
})
// sum up the length with reduce
var watchersCount = watchersLengths.reduce(function(a,b) {
    return a + b;
});
console.log("watchersCount: " + watchersCount);