dropRightWhile (Functional Programming)

Creates a function that drops trailing values while a predicate passes. Use it with pipe.

const result = pipe(array, dropRightWhile(predicate));

::: info

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

:::

Usage

dropRightWhile walks the piped array from the end and removes values while predicate returns true. It stops at the first value that does not pass.

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

pipe(
  [1, 2, 3, 4],
  dropRightWhile(value => value > 2)
); // => [1, 2]

Parameters

• predicate ((item: T) => boolean): The function that decides whether a trailing value should be dropped.

Returns

((array: readonly T[]) => T[]): A function that maps a readonly T[] to the values left after dropping from the end.