dropWhile (Functional Programming)

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

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

INFO

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

Usage

dropWhile walks the piped array from the beginning and removes values while predicate returns true. It is lazy-capable inside pipe.

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

pipe(
  [1, 2, 3, 1],
  dropWhile(value => value < 3)
); // => [3, 1]

Parameters

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

Returns

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