<A>(update: (a: A) => A): (self: SubscriptionRef<A>) => Effect.Effect<A>
<A>(self: SubscriptionRef<A>, update: (a: A) => A): Effect.Effect<A>Retrieves the current value and updates it atomically with the result of applying a function, notifying subscribers of the change.
Example (Getting and updating a value)
import { Effect, SubscriptionRef } from "effect"
const program = Effect.gen(function*() {
const ref = yield* SubscriptionRef.make(10)
const oldValue = yield* SubscriptionRef.getAndUpdate(ref, (n) => n * 2)
console.log("Old value:", oldValue)
const newValue = yield* SubscriptionRef.get(ref)
console.log("New value:", newValue)
})getters
Source effect/SubscriptionRef.ts:27610 lines
export const const getAndUpdate: {
<A>(update: (a: A) => A): (
self: SubscriptionRef<A>
) => Effect.Effect<A>
<A>(
self: SubscriptionRef<A>,
update: (a: A) => A
): Effect.Effect<A>
}
Retrieves the current value and updates it atomically with the result of
applying a function, notifying subscribers of the change.
Example (Getting and updating a value)
import { Effect, SubscriptionRef } from "effect"
const program = Effect.gen(function*() {
const ref = yield* SubscriptionRef.make(10)
const oldValue = yield* SubscriptionRef.getAndUpdate(ref, (n) => n * 2)
console.log("Old value:", oldValue)
const newValue = yield* SubscriptionRef.get(ref)
console.log("New value:", newValue)
})
getAndUpdate: {
<function (type parameter) A in <A>(update: (a: A) => A): (self: SubscriptionRef<A>) => Effect.Effect<A>A>(update: (a: A) => Aupdate: (a: Aa: function (type parameter) A in <A>(update: (a: A) => A): (self: SubscriptionRef<A>) => Effect.Effect<A>A) => function (type parameter) A in <A>(update: (a: A) => A): (self: SubscriptionRef<A>) => Effect.Effect<A>A): (self: SubscriptionRef<A>(parameter) self: {
value: A;
semaphore: Semaphore.Semaphore;
pubsub: PubSub.PubSub<A>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
}
interface SubscriptionRef<in out A>A mutable reference whose updates are serialized and published to
subscribers.
When to use
Use to observe the current value and subsequent updates as a
stream.
The SubscriptionRef namespace containing type definitions associated with
subscription references.
SubscriptionRef<function (type parameter) A in <A>(update: (a: A) => A): (self: SubscriptionRef<A>) => Effect.Effect<A>A>) => import EffectEffect.type Effect.Effect = /*unresolved*/ anyEffect<function (type parameter) A in <A>(update: (a: A) => A): (self: SubscriptionRef<A>) => Effect.Effect<A>A>
<function (type parameter) A in <A>(self: SubscriptionRef<A>, update: (a: A) => A): Effect.Effect<A>A>(self: SubscriptionRef<A>(parameter) self: {
value: A;
semaphore: Semaphore.Semaphore;
pubsub: PubSub.PubSub<A>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
}
interface SubscriptionRef<in out A>A mutable reference whose updates are serialized and published to
subscribers.
When to use
Use to observe the current value and subsequent updates as a
stream.
The SubscriptionRef namespace containing type definitions associated with
subscription references.
SubscriptionRef<function (type parameter) A in <A>(self: SubscriptionRef<A>, update: (a: A) => A): Effect.Effect<A>A>, update: (a: A) => Aupdate: (a: Aa: function (type parameter) A in <A>(self: SubscriptionRef<A>, update: (a: A) => A): Effect.Effect<A>A) => function (type parameter) A in <A>(self: SubscriptionRef<A>, update: (a: A) => A): Effect.Effect<A>A): import EffectEffect.type Effect.Effect = /*unresolved*/ anyEffect<function (type parameter) A in <A>(self: SubscriptionRef<A>, update: (a: A) => A): Effect.Effect<A>A>
} = import dualdual(2, <function (type parameter) A in <A>(self: SubscriptionRef<A>, update: (a: A) => A): anyA>(self: SubscriptionRef<A>(parameter) self: {
value: A;
semaphore: Semaphore.Semaphore;
pubsub: PubSub.PubSub<A>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
}
interface SubscriptionRef<in out A>A mutable reference whose updates are serialized and published to
subscribers.
When to use
Use to observe the current value and subsequent updates as a
stream.
The SubscriptionRef namespace containing type definitions associated with
subscription references.
SubscriptionRef<function (type parameter) A in <A>(self: SubscriptionRef<A>, update: (a: A) => A): anyA>, update: (a: A) => Aupdate: (a: Aa: function (type parameter) A in <A>(self: SubscriptionRef<A>, update: (a: A) => A): anyA) => function (type parameter) A in <A>(self: SubscriptionRef<A>, update: (a: A) => A): anyA) =>
self: SubscriptionRef<A>(parameter) self: {
value: A;
semaphore: Semaphore.Semaphore;
pubsub: PubSub.PubSub<A>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
}
SubscriptionRef<in out A>.semaphore: Semaphore.Semaphore(property) SubscriptionRef<in out A>.semaphore: {
resize: (this: Semaphore, permits: number) => Effect.Effect<void>;
withPermits: (this: Semaphore, permits: number) => <A, E, R>(self: Effect.Effect<A, E, R>) => Effect.Effect<A, E, R>;
withPermit: <A, E, R>(self: Effect.Effect<A, E, R>) => Effect.Effect<A, E, R>;
withPermitsIfAvailable: (this: Semaphore, permits: number) => <A, E, R>(self: Effect.Effect<A, E, R>) => Effect.Effect<Option.Option<A>, E, R>;
take: (this: Semaphore, permits: number) => Effect.Effect<number>;
release: (this: Semaphore, permits: number) => Effect.Effect<number>;
releaseAll: Effect.Effect<number>;
}
import EffectEffect.sync(() => {
const const current: Acurrent = self: SubscriptionRef<A>(parameter) self: {
value: A;
semaphore: Semaphore.Semaphore;
pubsub: PubSub.PubSub<A>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
}
SubscriptionRef<A>.value: Avalue
const const newValue: AnewValue = update: (a: A) => Aupdate(const current: Acurrent)
const setUnsafe: <A>(
self: SubscriptionRef<A>,
value: A
) => void
self: SubscriptionRef<A>(parameter) self: {
value: A;
semaphore: Semaphore.Semaphore;
pubsub: PubSub.PubSub<A>;
pipe: { <A>(this: A): A; <A, B = never>(this: A, ab: (_: A) => B): B; <A, B = never, C = never>(this: A, ab: (_: A) => B, bc: (_: B) => C): C; <A, B = never, C = never, D = never>(this: A, ab: (_: A) => B, bc: (_: B) => C, cd: (_: C) => D): D; <…;
}
const newValue: AnewValue)
return const current: Acurrent
})))