Bookmarklet to count AngularJS watches

angular-watchcount.js

// Instructions - create a bookmark.  Save this code as the url.
// Click the bookmarklet to see watch count output in the console.
// Currently counts watches by nodeName.  It would be more useful by class. TBD.
javascript: (function () {
  var totalWatches = 0;
  var watchesByElem = {};
  angular.forEach(angular.element('.ng-scope'), function (elem) {
    var s = angular.element(elem).scope();
    var w = s.$$watchers;
    if (s.$$watchers) {
      watchesByElem[elem.nodeName] = watchesByElem[elem.nodeName]||0;
      totalWatches += w.length;
      watchesByElem[elem.nodeName] += w.length;
      }  
  });
  console.log('Total Watches # ',totalWatches);
  console.log('Breakdown by nodeName:');
  for(var name in watchesByElem){
    console.log(name,watchesByElem[name]);
  }
})();

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