effect-io-ai

Package: effect
Module: TxSubscriptionRef

TxSubscriptionRef.updateAndGet

Updates the value using a function and returns the new value. Publishes the new value to all subscribers.

When to use

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

Example (Updating and reading atomically)

import { Effect, TxSubscriptionRef } from "effect"

const program = Effect.gen(function*() {
  const ref = yield* TxSubscriptionRef.make(3)
  const result = yield* TxSubscriptionRef.updateAndGet(ref, (n) => n * 3)
  console.log(result) // 9
})

See

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

Signature

declare const updateAndGet: { <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