last

Import

import { last } from "@typed/fx/RefArray";

Signatures

export declare const last: <A, E, R>(ref: RefArray<A, E, R>) => RefSubject.Filtered<A, E, R>;

Why

Models the possibly absent result of last as Filtered state, so absence stays explicit while later source versions can make a value available.

Ownership and lifetime

The last view retains no independent value. Its Effect read fails with NoSuchElement while absent; the observing Scope owns and finalizes its Fx subscription.

Examples

import { Effect } from "effect"
import * as RefArray from "@typed/fx/RefArray"

const program = Effect.gen(function* () {
  const items = yield* RefArray.make([1, 2, 3, 4, 5])

  const last = RefArray.last(items)
  const value = yield* last
  console.log(value) // 5

  // If array becomes empty, Filtered will fail
  yield* RefArray.set(items, [])
  // yield* last would fail with NoSuchElementError
})

Other public imports

These import paths expose the same declaration. Each page retains its own public name and signature.

• RefArray.last from @typed/fx

Source

• packages/fx/src/RefSubject/RefArray.ts:824