effect-io-ai

Package: effect
Module: Array

Array.findLastIndex

Returns the index of the last element matching the predicate, wrapped in an Option.

When to use

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

Example (Finding the last matching index)

import { Array } from "effect"

console.log(Array.findLastIndex([1, 3, 8, 9], (x) => x < 5)) // Option.some(1)

See

• findFirstIndex — search from the start
• findLast — get the element itself

Signature

declare const findLastIndex: { <A>(predicate: (a: NoInfer<A>, i: number) => boolean): (self: Iterable<A>) => Option.Option<number>; <A>(self: Iterable<A>, predicate: (a: A, i: number) => boolean): Option.Option<number>; }

Source

Since v2.0.0