Learn more about Mintlify
Enter your email to receive updates about new features and product releases.
API reference for the List immutable linked list type
List is an immutable linked list data structure.
type List<A> = Cons<A> | Nil
List.
const nil: <A = never>() => List<A>
List.
const cons: <A>(head: A, tail: List<A>) => List<A>
List from values.
const make: <As extends ReadonlyArray<any>>(...as: As) => List<As[number]>
const head: <A>(self: List<A>) => Option<A>
const tail: <A>(self: List<A>) => Option<List<A>>
List.
const map: <A, B>(f: (a: A) => B) => (self: List<A>) => List<B>
import { List } from "effect"
const list = List.make(1, 2, 3).pipe(
List.prepend(0),
List.map(n => n * 2)
)
console.log(List.head(list)) // Some(0)