effect-io-ai

Package: effect
Module: TxSubscriptionRef

TxSubscriptionRef.getAndSet

Gets the current value and sets a new value atomically. Publishes the new value to all subscribers.

When to use

Use to replace a TxSubscriptionRef value while returning the previous value and publishing the update to subscribers.

Example (Getting and setting atomically)

import { Effect, TxSubscriptionRef } from "effect"

const program = Effect.gen(function*() {
  const ref = yield* TxSubscriptionRef.make("a")
  const old = yield* TxSubscriptionRef.getAndSet(ref, "b")
  console.log(old) // "a"
  console.log(yield* TxSubscriptionRef.get(ref)) // "b"
})

See

• set for setting without returning the previous value
• getAndUpdate for deriving the new value from the previous value

Signature

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

Source

Since v3.10.0