angular snippets

idleDigest.js

/**
 * Pass rootElement ($0), and rounds. Default amount of rounds is 1000.
 *
 * Don't bump it up to say a million rounds over a set of 5000 watchers, it will take a *long* time. 
 */

function idleDigestTime (root, rounds) {
  var results = [];
  
  angular.element(root).injector().invoke(function ($rootScope) {
    for (var i = 0; i < (rounds || 1000); i++) {
      var x = performance.now();
      $rootScope.$apply();
      results.push(performance.now() - x);
    }
  });

  var sum = results.reduce(function (acc, n) {
    return acc + n;
  });

  console.log('Your average idle $digest time is: ', (sum / results.length).toFixed(3), ' ms');
}

watchCount.js

function getWatchers(root) {
  root = angular.element(root || document.documentElement);
  var watcherCount = 0;
 
  function getElemWatchers(element) {
    var isolateWatchers = getWatchersFromScope(element.data().$isolateScope);
    var scopeWatchers = getWatchersFromScope(element.data().$scope);
    var watchers = scopeWatchers.concat(isolateWatchers);
    angular.forEach(element.children(), function (childElement) {
      watchers = watchers.concat(getElemWatchers(angular.element(childElement)));
    });
    return watchers;
  }
  
  function getWatchersFromScope(scope) {
    if (scope) {
      return scope.$$watchers || [];
    } else {
      return [];
    }
  }
 
  return getElemWatchers(root);
}