last (Functional Programming)

Creates a function that returns the last value of an array. Use it with pipe.

const result = pipe(array, last());

INFO

Prefer the original es-toolkit last in ordinary code. Use this fp variant when composing transformations with pipe.

Usage

last returns the last value in the piped array. If the array is empty, it returns undefined.

import { last, pipe } from 'es-toolkit/fp';

pipe([1, 2, 3], last()); // => 3

pipe([], last()); // => undefined

Parameters

This function takes no arguments; call it as last().

Returns

((array: readonly T[]) => T | undefined): A function that maps a readonly T[] to its last value.