What advantages does linkedSignal offer over computed in Angular Signals?

I'm currently exploring the distinctions between linkedSignal and computed within Angular's Signals system, and considering reasons why linkedSignal might be preferred in specific circumstances.

For instance, when dealing with a selectedOption that relies on shippingOptions, why would one not utilize computed as shown below:

const shippingOptions = signal(['Ground', 'Air', 'Sea']);
const selectedOption = computed(() => shippingOptions()[0]);

What advantages does linkedSignal offer in situations like these?

While I haven't tested this yet, I am delving into the fundamental variances between linkedSignal and computed. As far as my current understanding goes, computed seems suitable for managing dependent state. The question remains: why is linkedSignal considered the superior choice in Angular's Signals framework?

angulartypescriptangular-signalsangular19

Answer №1

A linkedSignal is a type of writable signal that originates from another reactive expression.

It's worth noting that:

const selectedOption = linkedSignal(() => shippingOptions()[0]);

is equivalent to

const selectedOption = computed(() => shippingOptions()[0]);

when it comes to observing the signal and reacting to any changes.

However, a linked signal can also be modified locally since it is a WritableSignal.

const selectedOption = linkedSignal(() => shippingOptions()[0]);
selectionOption('myNewValue').

Furthermore, using a linkedSignal enables access to previous values during computations:

const selectedOption = linkedSignal({
  source: shippingOptions(),
  computation: (newValue, previousValue) => { value[0] }
});

An application scenario for linkedSignal involves creating localized state within a component that relies on an input(), allowing internal modifications without exposing the inner workings - unlike what would be done with model.

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