<A>(value: A): Effect<Option<A>>Returns an effect which succeeds with the value wrapped in a Some.
Example (Succeeding with Option.some)
import { Effect } from "effect"
const program = Effect.succeedSome(42)
Effect.runPromise(program).then(console.log)
// Output: { _id: 'Option', _tag: 'Some', value: 42 }export const const succeedSome: <A>(
value: A
) => Effect<Option<A>>
Returns an effect which succeeds with the value wrapped in a Some.
Example (Succeeding with Option.some)
import { Effect } from "effect"
const program = Effect.succeedSome(42)
Effect.runPromise(program).then(console.log)
// Output: { _id: 'Option', _tag: 'Some', value: 42 }
succeedSome: <function (type parameter) A in <A>(value: A): Effect<Option<A>>A>(value: Avalue: function (type parameter) A in <A>(value: A): Effect<Option<A>>A) => interface Effect<out A, out E = never, out R = never>The Effect interface defines a value that lazily describes a workflow or
job. The workflow requires some context R, and may fail with an error of
type E, or succeed with a value of type A.
When to use
Use when you need to represent a lazy, composable workflow that can require
services, fail with a typed error, or succeed with a typed value.
Details
Effect values model resourceful interaction with the outside world,
including synchronous, asynchronous, concurrent, and parallel interaction.
They use a fiber-based concurrency model, with built-in support for
scheduling, fine-grained interruption, structured concurrency, and high
scalability.
To run an Effect value, you need a Runtime, which is a type that is
capable of executing Effect values.
Effect<type Option<A> = None<A> | Some<A>The Option data type represents optional values. An Option<A> is either
Some<A>, containing a value of type A, or None, representing absence.
When to use
Use to represent initial values that may not yet exist
- Returning from partial functions (not defined for all inputs)
- Managing optional fields in data structures
Namespace containing utility types for Option.
When to use
Use to access type-level helpers associated with Option.
Option<function (type parameter) A in <A>(value: A): Effect<Option<A>>A>> = import internalinternal.const succeedSome: <A>(
a: A
) => Effect.Effect<Option.Option<A>>