What is ‘cheaper’ performance-wise $broadcast or $watch

by

$watch() is doing dirt-checking: the function makes a comparison each digest cycle. On the other hand, $broadcast() propagates an event only when there is one. Naturally, $broadcast() is cheaper than $watch().

But did you really have to worry about performance here? One primitive comparison by cycle is nothing. However, conceptually, $watch() is clearly what you need: you want to do an action each time a variable changes. I can’t imagine using $broadcast() here.

More Related Contents:

  1. The Advantages when we put AngularJS within Symfony web application
  2. Why does AngularJS include an empty option in select?
  3. AngularJS access parent scope from child controller
  4. How to Display blob (.pdf) in an AngularJS app
  5. How to execute AngularJS controller function on page load?
  6. AngularJS: How to make angular load script inside ng-include?
  7. Injecting $scope into an angular service function()
  8. How do I store data in local storage using Angularjs?
  9. Angularjs dynamic ng-pattern validation
  10. Is there a way to make AngularJS load partials in the beginning and not at when needed?
  11. Angular $scope.$apply vs $timeout as a safe $apply
  12. What’s the most concise way to read query parameters in AngularJS?
  13. Preserve line breaks in angularjs
  14. Getting an error when using ng-controller in angularjs ver 1.3.0 [duplicate]
  15. Dynamically set the value of ui-sref Angularjs
  16. AngularJS dependency injection of value inside of module.config
  17. How to access/update $rootScope from outside Angular
  18. How to modify scope from within a directive in AngularJs
  19. How to check internet connection in AngularJs
  20. Angular JS – Automatically focus input and show typeahead dropdown – ui.bootstrap.typeahead
  21. Angular clear subform data and reset validation
  22. What is `priority` of ng-repeat directive can you change it?
  23. Track to see when a view changes in angularjs
  24. How to use `replace` of directive definition?
  25. How to implement an ng-change for a custom directive
  26. ng-repeat specify a starting index
  27. how to make synchronous http request in angular js
  28. How to detect if a user clicks browser back button in Angularjs
  29. how do I get ng-include directive to work with a Content Delivery Network?
  30. Inject module dynamically, only if required

Leave a Comment