Is it advisable to switch all properties to Angular Signals?

Recently, I've been utilizing signals to replace certain properties in my components that would typically require computed logic or be reactive to the effect hook. It got me thinking - should I be replacing all of my properties with signals, even if they never change?

For instance, consider this component with a property called items, which is simply an array of objects used in the template to populate a dropdown. Is there any advantage to wrapping it in a signal instead of just keeping it as a regular property, especially if the property remains constant and is only set during initialization:

@Component({
  selector: 'mobile-app-icons',
  standalone: true,
  templateUrl: './mobile-app-icons.component.html',
  styleUrl: './mobile-app-icons.component.scss',
  changeDetection: ChangeDetectionStrategy.OnPush,
  imports: [
  ],
})
export class MobileAppIconsComponent {
 // Would turning this into a signal have any benefits
  iconTypes = [
    {
      title: 'App icon',
      key: 'APP_ICON',
      description: 'AppIconExplanation',
    },
    {
      title: 'Splash screen icon',
      key: 'SPLASH_ICON',
      description: 'SplashIconExplanation',
    },
  ];
}

On the surface, it seems like making this change wouldn't make much difference. However, I'm curious if there are any advantages in terms of change detection, or if I can simply keep these "simple" properties as they currently are.

Answer №1

When a variable (field, property) remains constant, there is no advantage to using a Signal to wrap it. Doing so would only introduce unnecessary performance overhead.

Answer №2

It seems that there are no benefits to be gained in terms of change detection in this scenario.

However, one possible approach could be to convert this into a read-only Signal. By doing so, any attempts to modify the value in the future would be prevented, forcing a necessary change in the implementation.

Failure to take such precautions could result in someone inadvertently modifying the value and then being puzzled as to why nothing happens on the template.

readonly iconTypes: Signal<IconTypes[]> = signal([
        {
            title: 'App icon',
            key: 'APP_ICON',
            description: 'AppIconExplanation',
        },
        {
            title: 'Splash screen icon',
            key: 'SPLASH_ICON',
            description: 'SplashIconExplanation',
        },
    ]);

In implementing this, you would prevent:

  • Any changes to the value, given that the Signal type lacks a setter function
  • Any new assignments to the 'iconTypes' Signal due to its readonly status

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