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/toFilled.md.
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    toFilled (Functional Programming) es-toolkit

    Creates a function that returns a filled copy of an array. Use it with pipe.

    const result = pipe(array, toFilled(value, start, end));
    Info

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

    Usage

    toFilled fills a copy of the piped array with value from start up to, but not including, end. It follows Array.prototype.fill index semantics and does not mutate the input array.

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

const array = [1, 2, 3, 4];

pipe(array, toFilled(0, 1, 3)); // => [1, 0, 0, 4]
array; // => [1, 2, 3, 4]

    Parameters

    valueUrequired

    The value to write into the returned array.

    startnumber, optionalrequired

    The start index. Defaults to 0.

    endnumber, optionalrequired

    The end index. Defaults to the array length.

    Returns

    A function that maps a readonly T[] to a filled copy.

    (array: readonly T[]) => Array<T | U>
    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.