setAtOrElse

function Array.setAtOrElse<T, U>(
    target: readonly T[],
    idx: number,
    value: NoInfer<T>,
    orElse: (target: readonly NoInfer<T>[]) => U,
): readonly T[] | U

Sets the value at the specified idx in target to value. If the index is out of bounds, calls orElse with the original array.

Example

data-first

import { Array } from "@monstermann/array";

Array.setAtOrElse([1, 2, 3], 1, 9, () => []); // [1, 9, 3]
Array.setAtOrElse([1, 2, 3], -1, 9, () => []); // [1, 2, 9]
Array.setAtOrElse([1, 2, 3], 5, 9, (arr) => arr); // [1, 2, 3]

data-last

import { Array } from "@monstermann/array";

pipe(
    [1, 2, 3],
    Array.setAtOrElse(1, 9, () => []),
); // [1, 9, 3]

pipe(
    [1, 2, 3],
    Array.setAtOrElse(-1, 9, () => []),
); // [1, 2, 9]

pipe(
    [1, 2, 3],
    Array.setAtOrElse(5, 9, (arr) => arr),
); // [1, 2, 3]