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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | 1x 5x 1x 5x 5x 5x 5x 5x | import { mod } from "@benneq/number";
import { RelativeIndex } from "./_types";
/**
*
* @example
* ```ts
* const array = [1, 2, 3];
* const index = -5;
*
* const normalizedIndex = normalizeIndex(index)(array);
*
* console.log(normalizedIndex); // 1
* ```
*
* @param array
* @param index
* @returns the normalized index, or `0` if the array is empty
*/
export const normalizeIndex =
(index: RelativeIndex) =>
(array: ArrayLike<unknown>): number => {
if (process.env.NODE_ENV !== "production") {
console.assert(index >= -array.length);
console.assert(index < array.length);
}
return mod(index, array.length);
};
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