What is digest cycle in angularjs


The digest cycle is the process that AngularJS uses to keep track of all the changes in your app. It does this byruns through a loop of all the watchers in your app. When it comes to performance, the digest cycle is very important. It can have a big impact on how quickly your app responds to user input, and how smoothly it renders changes.

What is Digest Cycle?

In AngularJS, when you make changes to the data model either using controllers, services or filters, the changes are not immediately reflected in the view. This is because, for performance reasons, AngularJS only runs a so-called “digest cycle” to update the view when necessary. The digest cycle usually starts automatically after one of these events:

-A JavaScript event such as a click, keypress or mouseover
-An AngularJS event such as $http service call
-An interval created by the $interval service
As a result, you don’t need to worry about calling a function toupdate the view every time the data model changes. However, there are times when you need to trigger a digest cycle manually, for example when working with third-party libraries. In such cases, you can use the $scope.$apply() function.

Why is Digest Cycle Important?

If you’ve ever worked with AngularJS, you’ve probably heard of the “digest cycle.” But what is it, and why is it so important?

Simply put, the digest cycle is a process that AngularJS goes through to ensure that all of the data in your application is up-to-date. It does this by checking for changes in data bindings, and then updating the view (or DOM) accordingly.

This is important because it allows AngularJS to keep your application data synchronized without you having to write additional code to do so. It also means that AngularJS can update the view asynchronously, which can improve performance since the browser doesn’t have to wait for all of the data to be updated before rendering the view.

The digest cycle runs automatically whenever a data binding is updated, but there are also times when you’ll need to trigger it manually. For example, if you’re using an external library that doesn’t play nicely with AngularJS, you may need to trigger a digest cycle manually in order to ensure that your application data is still being updated correctly.

In general, you shouldn’t need to worry about the digest cycle too much. Unless you’re having problems with data synchronization or performance, it’s usually best just to let AngularJS handle it automatically.

How to Use Digest Cycle?

Digest cycle is a kind of automatic dirty checking process in AngularJS. When some data is changed in theAngular scope, all watchers of that data will be checked to see if any action needs to be performed on it. If a watcher is found, the corresponding listener function will be called and the registered value will be updated. This process happens automatically, so that you don’t have to do it manually.


The digest cycle is a process in AngularJS that checks for changes in the model and updates the view accordingly. The digest cycle starts when a model value changes. AngularJS runs through a series of steps to check if any other values have changed, and if so, updates the view with the new values. The digest cycle ends when there are no more changes to be made.

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