Is there a way to retrieve the previous value of a signal?
const [route, setRoute] = createSignal(1)
createEffect(() => {
console.log('The previous value of route is', route(0))
console.log('The updated value of route is', route())
})
Is there a way to retrieve the previous value of a signal?
const [route, setRoute] = createSignal(1)
createEffect(() => {
console.log('The previous value of route is', route(0))
console.log('The updated value of route is', route())
})
If you use a callback function with createEffect, it can accept an argument that is equal to the value returned from the previous call of the effect function. This allows you to do the following:
const [currentRoute, updateRoute] = createSignal(1);
createEffect((previous) => {
const updatedRoute = currentRoute();
console.log('Previous route value:', previous);
console.log('Updated route value:', updatedRoute);
return updatedRoute;
}, currentRoute());
Keep in mind that the second argument provided to createEffect serves as the initial value for previous.
You can find more information about this feature in the createEffect section of the Solid API documentation.
To incorporate the previous signal value in generating a new one, you can utilize a function within the signal setter function that takes the current value as an argument.
const [number, setNumber] = createSignal(0)
// The setter also gives back the updated value.
const newNumber = setNumber((prev) => prev * 2);
Source: createSignal API reference
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