lastIndexOfOrThrow

function Array.lastIndexOfOrThrow<T>(
    target: readonly T[],
    value: NoInfer<T>,
): number

Returns the index of the last occurrence of value in target. If value is not found, throws an error.

Example

data-first

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

Array.lastIndexOfOrThrow([1, 2, 3, 2], 2); // 3
Array.lastIndexOfOrThrow([1, 2, 3], 4); // throws FnError

data-last

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

pipe([1, 2, 3, 2], Array.lastIndexOfOrThrow(2)); // 3
pipe([1, 2, 3], Array.lastIndexOfOrThrow(4)); // throws FnError