effect-io-ai

Package: effect
Module: TxSubscriptionRef

TxSubscriptionRef.getAndUpdate

Gets the current value and updates it using a function atomically. Publishes the new value to all subscribers.

When to use

Use to derive and publish a new TxSubscriptionRef value while returning the previous value.

Example (Getting and updating atomically)

import { Effect, TxSubscriptionRef } from "effect"

const program = Effect.gen(function*() {
  const ref = yield* TxSubscriptionRef.make(1)
  const old = yield* TxSubscriptionRef.getAndUpdate(ref, (n) => n + 10)
  console.log(old) // 1
  console.log(yield* TxSubscriptionRef.get(ref)) // 11
})

See

• update for updating without returning the previous value
• updateAndGet for returning the new value instead

Signature

declare const getAndUpdate: { <A>(f: (current: A) => A): (self: TxSubscriptionRef<A>) => Effect.Effect<A>; <A>(self: TxSubscriptionRef<A>, f: (current: A) => A): Effect.Effect<A>; }

Source

Since v3.10.0