For AI agents: the complete documentation index is available at /llms.txt, the full documentation bundle is available at /llms-full.txt, and this page is available as Markdown at /reference/fp/intersection.md.
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    intersection (Functional Programming) es-toolkit

    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

    secondArrayreadonly T[]required

    The array containing values to keep.

    Returns

    A function that maps a readonly T[] to values also found in secondArray.

    (array: readonly T[]) => T[]
    Source: es-toolkit

    Re-exported verbatim from es-toolkit. Implementation, edge cases, and performance behavior are owned upstream. This page mirrors the documentation at the pinned version; the linked source is authoritative.