ngDoCheck Angular | ngdocheck lifecycle hook in Angular | Complete Angular Tutorial For Beginners

Published: 31 August 2022
on channel: WebGentle
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Angular Tutorial: ngDoCheck Angular is a lifecycle hook in Angular. ngDoCheck is a lifecycle hook in Angular that is called whenever Angular detects a change in the component's or directive's state. It is called during every change detection cycle and is used for custom change detection and performance optimization.

ngDoCheck is called after the ngOnInit hook and before the ngAfterContentChecked and ngAfterViewChecked hooks. It is a powerful hook that provides access to the change detector and can be used to implement custom change detection strategies.

Here are some use cases of ngDoCheck:

Custom change detection: If a component or directive has complex state that cannot be detected by Angular's default change detection mechanism, ngDoCheck can be used to implement custom change detection.

Performance optimization: ngDoCheck can be used to optimize the performance of a component or directive. For example, if a component has a large number of bindings, ngDoCheck can be used to perform expensive calculations only when necessary.

Debugging: ngDoCheck can be used to log or debug changes in a component's or directive's state.

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