intersection (Functional Programming)

Creates a function that keeps values found in another array. Use it with pipe.

const result = pipe(array, intersection(secondArray));

::: info

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

:::

Usage

intersection keeps values from the piped array that are also present in secondArray. It preserves the order of the piped array.

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

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

Parameters

• secondArray (readonly T[]): The array containing values to keep.

Returns

((array: readonly T[]) => T[]): A function that maps a readonly T[] to values also found in secondArray.