effect-io-ai

Package: effect
Module: SubscriptionRef

SubscriptionRef.getAndSet

Retrieves the current value and sets a new value atomically, notifying subscribers of the change.

Example (Getting and setting a value)

import { Effect, SubscriptionRef } from "effect"

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

  const oldValue = yield* SubscriptionRef.getAndSet(ref, 20)
  console.log("Old value:", oldValue)

  const newValue = yield* SubscriptionRef.get(ref)
  console.log("New value:", newValue)
})

Signature

declare const getAndSet: { <A>(value: A): (self: SubscriptionRef<A>) => Effect.Effect<A>; <A>(self: SubscriptionRef<A>, value: A): Effect.Effect<A>; }

Source

Since v2.0.0