effect-io-ai

Package: effect
Module: Array

Array.findLast

Returns the last element matching a predicate, refinement, or mapping function, wrapped in Option.

When to use

Use to find the last matching element from the end of an array.

Details

Searches from the end of the array. If no element matches, this returns Option.none().

Example (Finding the last match)

import { Array } from "effect"

console.log(Array.findLast([1, 2, 3, 4, 5], (n) => n % 2 === 0)) // Option.some(4)

See

• findFirst — search from the start
• findLastIndex — get the index instead

Signature

declare const findLast: { <A, B>(f: (a: NoInfer<A>, i: number) => Option.Option<B>): (self: Iterable<A>) => Option.Option<B>; <A, B extends A>(refinement: (a: NoInfer<A>, i: number) => a is B): (self: Iterable<A>) => Option.Option<B>; <A>(predicate: (a: NoInfer<A>, i: number) => boolean): (self: Iterable<A>) => Option.Option<A>; <A, B>(self: Iterable<A>, f: (a: A, i: number) => Option.Option<B>): Option.Option<B>; <A, B extends A>(self: Iterable<A>, refinement: (a: A, i: number) => a is B): Option.Option<B>; <A>(self: Iterable<A>, predicate: (a: A, i: number) => boolean): Option.Option<A>; }

Source

Since v2.0.0