ChangeDetection in Angular: Strategies and Usage

Overview:

Angular applications are built using components, which are the fundamental building blocks of the user interface. When a component is created, Angular automatically creates a change detector associated with it. The change detector is responsible for detecting changes in the component's bindings and updating the view accordingly. The  property allows you to specify the change-detection strategy for a particular component. changeDetection

changeDetection Property:

The  property is an optional property that you can include in an Angular component. Its purpose is to define the change-detection strategy for that specific component. changeDetection


Change-Detection Strategies:

1. :"ChangeDetectionStrategy.OnPush"

    - Description: This strategy sets the change detection to "CheckOnce" (on demand).
    - Usage: It's beneficial when you want to optimize performance by reducing the number of change detection cycles. It means the change detection will only occur when one of the input properties of the component changes or when an event is triggered.


2. :"ChangeDetectionStrategy.Default"

    - Description: This is the default change-detection strategy, and it sets the strategy to "CheckAlways".
    - Usage: It's suitable for components where you expect frequent changes and want the view to be updated regularly.


When to Use Each Strategy:

Use "ChangeDetectionStrategy.OnPush" when:

    - You want to optimize performance by reducing unnecessary change detection cycles.
    - The component's view doesn't need to be updated frequently.
    - You have pure or immutable data structures as input properties.

Use "ChangeDetectionStrategy.Default" when:

    - You expect frequent changes in the component's data.
    - The component's view needs to be updated regularly based on changes in its input properties.

Summary:

In summary, the  property in Angular allows you to control how change detection is performed for a specific component. Choosing the appropriate strategy depends on the specific requirements of your component and the desired balance between performance optimization and view updates. The  strategy is often used to improve performance, while the  strategy is suitable for components with frequent changes. "changeDetection" "OnPush" "Default"

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