Hyperlinkv0.8.0-beta.28

SubscriptionRef

SubscriptionRef.updateEffectconsteffect/SubscriptionRef.ts:752
<A, E, R>(update: (a: A) => Effect.Effect<A, E, R>): (
  self: SubscriptionRef<A>
) => Effect.Effect<void, E, R>
<A, E, R>(
  self: SubscriptionRef<A>,
  update: (a: A) => Effect.Effect<A, E, R>
): Effect.Effect<void, E, R>

Updates the value of the SubscriptionRef with the result of applying an effectful function, notifying subscribers of the change.

Example (Updating with an effect)

import { Effect, SubscriptionRef } from "effect"

const program = Effect.gen(function*() {
  const ref = yield* SubscriptionRef.make(10)

  yield* SubscriptionRef.updateEffect(ref, (n) => Effect.succeed(n + 5))

  const value = yield* SubscriptionRef.get(ref)
  console.log(value)
})
updating
export const updateEffect: {
  <A, E, R>(update: (a: A) => Effect.Effect<A, E, R>): (self: SubscriptionRef<A>) => Effect.Effect<void, E, R>
  <A, E, R>(self: SubscriptionRef<A>, update: (a: A) => Effect.Effect<A, E, R>): Effect.Effect<void, E, R>
} = dual(2, <A, E, R>(
  self: SubscriptionRef<A>,
  update: (a: A) => Effect.Effect<A, E, R>
) =>
  self.semaphore.withPermit(
    Effect.suspend(() => Effect.map(update(self.value), (newValue) => setUnsafe(self, newValue)))
  ))