<A, B>(modify: (a: A) => readonly [B, A]): (
self: SubscriptionRef<A>
) => Effect.Effect<B>
<A, B>(
self: SubscriptionRef<A>,
f: (a: A) => readonly [B, A]
): Effect.Effect<B>Modifies the SubscriptionRef atomically with a function that computes a
return value and a new value, notifying subscribers of the change.
Example (Modifying a value)
import { Effect, SubscriptionRef } from "effect"
const program = Effect.gen(function*() {
const ref = yield* SubscriptionRef.make(10)
const result = yield* SubscriptionRef.modify(ref, (n) => [
`Old value was ${n}`,
n * 2
])
console.log(result)
const newValue = yield* SubscriptionRef.get(ref)
console.log("New value:", newValue)
})modifications
Source effect/SubscriptionRef.ts:46412 lines
export const const modify: {
<A, B>(modify: (a: A) => readonly [B, A]): (
self: SubscriptionRef<A>
) => Effect.Effect<B>
<A, B>(
self: SubscriptionRef<A>,
f: (a: A) => readonly [B, A]
): Effect.Effect<B>
}
Modifies the SubscriptionRef atomically with a function that computes a
return value and a new value, notifying subscribers of the change.
Example (Modifying a value)
import { Effect, SubscriptionRef } from "effect"
const program = Effect.gen(function*() {
const ref = yield* SubscriptionRef.make(10)
const result = yield* SubscriptionRef.modify(ref, (n) => [
`Old value was ${n}`,
n * 2
])
console.log(result)
const newValue = yield* SubscriptionRef.get(ref)
console.log("New value:", newValue)
})
modify: {
<function (type parameter) A in <A, B>(modify: (a: A) => readonly [B, A]): (self: SubscriptionRef<A>) => Effect.Effect<B>A, function (type parameter) B in <A, B>(modify: (a: A) => readonly [B, A]): (self: SubscriptionRef<A>) => Effect.Effect<B>B>(modify: (a: A) => readonly [B, A]modify: (a: Aa: function (type parameter) A in <A, B>(modify: (a: A) => readonly [B, A]): (self: SubscriptionRef<A>) => Effect.Effect<B>A) => readonly [function (type parameter) B in <A, B>(modify: (a: A) => readonly [B, A]): (self: SubscriptionRef<A>) => Effect.Effect<B>B, function (type parameter) A in <A, B>(modify: (a: A) => readonly [B, A]): (self: SubscriptionRef<A>) => Effect.Effect<B>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, B>(modify: (a: A) => readonly [B, A]): (self: SubscriptionRef<A>) => Effect.Effect<B>A>) => import EffectEffect.type Effect.Effect = /*unresolved*/ anyEffect<function (type parameter) B in <A, B>(modify: (a: A) => readonly [B, A]): (self: SubscriptionRef<A>) => Effect.Effect<B>B>
<function (type parameter) A in <A, B>(self: SubscriptionRef<A>, f: (a: A) => readonly [B, A]): Effect.Effect<B>A, function (type parameter) B in <A, B>(self: SubscriptionRef<A>, f: (a: A) => readonly [B, A]): Effect.Effect<B>B>(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, B>(self: SubscriptionRef<A>, f: (a: A) => readonly [B, A]): Effect.Effect<B>A>, f: (a: A) => readonly [B, A]f: (a: Aa: function (type parameter) A in <A, B>(self: SubscriptionRef<A>, f: (a: A) => readonly [B, A]): Effect.Effect<B>A) => readonly [function (type parameter) B in <A, B>(self: SubscriptionRef<A>, f: (a: A) => readonly [B, A]): Effect.Effect<B>B, function (type parameter) A in <A, B>(self: SubscriptionRef<A>, f: (a: A) => readonly [B, A]): Effect.Effect<B>A]): import EffectEffect.type Effect.Effect = /*unresolved*/ anyEffect<function (type parameter) B in <A, B>(self: SubscriptionRef<A>, f: (a: A) => readonly [B, A]): Effect.Effect<B>B>
} = import dualdual(2, <function (type parameter) A in <A, B>(self: SubscriptionRef<A>, modify: (a: A) => readonly [B, A]): anyA, function (type parameter) B in <A, B>(self: SubscriptionRef<A>, modify: (a: A) => readonly [B, A]): anyB>(
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, B>(self: SubscriptionRef<A>, modify: (a: A) => readonly [B, A]): anyA>,
modify: (a: A) => readonly [B, A]modify: (a: Aa: function (type parameter) A in <A, B>(self: SubscriptionRef<A>, modify: (a: A) => readonly [B, A]): anyA) => readonly [function (type parameter) B in <A, B>(self: SubscriptionRef<A>, modify: (a: A) => readonly [B, A]): anyB, function (type parameter) A in <A, B>(self: SubscriptionRef<A>, modify: (a: A) => readonly [B, 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 b: Bb, const newValue: AnewValue] = modify: (a: A) => readonly [B, A]modify(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 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 b: Bb
})))