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/array/zipWith.md.
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    zipWith es-toolkit

    Creates a new array by combining multiple arrays using a custom function.

    const result = zipWith(...arrs, combine);

    Usage

    zipWith(...arrs, combine)

    Use zipWith when you want to combine elements at the same position from multiple arrays in a desired way. It passes elements at the same index from each array to the combine function and creates a new array from the results.

    import { zipWith } from 'es-toolkit/array';

// Add two number arrays.
zipWith([1, 2, 3], [4, 5, 6], (a, b) => a + b);
// Returns: [5, 7, 9]

// Concatenate strings.
zipWith(['a', 'b'], ['c', 'd'], ['e', 'f'], (a, b, c) => `${a}${b}${c}`);
// Returns: ['ace', 'bdf']

    If the arrays have different lengths, it adjusts to the longest array's length. Empty positions in shorter arrays are passed as undefined.

    import { zipWith } from 'es-toolkit/array';

zipWith([1, 2], [10, 20, 30], (a, b) => (a ?? 0) + (b ?? 0));
// Returns: [11, 22, 30]

    Parameters

    arrsArray<readonly T[]>required

    The arrays to combine.

    combine(...items: [...T[], number]) => Rrequired

    A function that receives elements at the same index from each array, followed by the index itself, and returns a new value.

    Returns

    Returns a new array consisting of results from applying the combine function.

    R[]
    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.