@monstermann/fn/dist/array/findLastIndexOrElse.js

A utility library for TypeScript.

import { dfdlT } from "@monstermann/dfdl";

//#region src/array/findLastIndexOrElse.ts
/**
* `findLastIndexOrElse(target, predicate, orElse)`
*
* Returns the index of the last element in `target` that satisfies the provided `predicate` function. If no element satisfies the predicate, calls `orElse` with the original array.
*
* ```ts
* findLastIndexOrElse(
*     [1, 3, 2, 4],
*     (x) => x > 2,
*     () => -1,
* ); // 3
* findLastIndexOrElse(
*     [1, 2, 3, 4],
*     (x) => x > 5,
*     (arr) => arr.length,
* ); // 4
* ```
*
* ```ts
* pipe(
*     [1, 3, 2, 4],
*     findLastIndexOrElse(
*         (x) => x > 2,
*         () => -1,
*     ),
* ); // 3
* pipe(
*     [1, 2, 3, 4],
*     findLastIndexOrElse(
*         (x) => x > 5,
*         (arr) => arr.length,
*     ),
* ); // 4
* ```
*/
const findLastIndexOrElse = dfdlT((target, predicate, orElse) => {
	const idx = target.findLastIndex(predicate);
	return idx < 0 ? orElse(target) : idx;
}, 3);

//#endregion
export { findLastIndexOrElse };