angular 1.x measure digest time

gistfile1.js

angular.element(document)
  .injector()
  .invoke(['$rootScope', function($rootScope) { 
    var a = performance.now(); 
    $rootScope.$apply(); 
    return performance.now()-a; 
  }])


angular.element(document)
  .injector()
  .invoke(['$rootScope', function($rootScope) { 
    var n = 100;
    var a = performance.now(); 
    for(var i=0; i<n; i++) {
      $rootScope.$apply(); 
    }
    return (performance.now()-a)/n; 
  }])

digestTime = ()=>{ angular.element(document) .injector() .invoke(['$rootScope', function($rootScope) { var n = 100; var a = performance.now(); for(var i=0; i<n; i++) { $rootScope.$apply(); } console.log((performance.now()-a)/n); }])}