25 lines
918 B
JavaScript
25 lines
918 B
JavaScript
//#region src/fp/array/findLastIndex.ts
|
|
/**
|
|
* Creates a function that returns the index of the last value matching a predicate.
|
|
*
|
|
* The predicate receives the value, index, and full input array while scanning from right
|
|
* to left. The returned function returns -1 when no value matches.
|
|
*
|
|
* @template T - The type of elements in the array.
|
|
* @param predicate - Called with each value, index, and array from right to left until it returns true.
|
|
* @returns A function that maps a readonly array to the last matching index, or -1.
|
|
*
|
|
* @example
|
|
* import { findLastIndex, pipe } from 'es-toolkit/fp';
|
|
*
|
|
* pipe([1, 2, 3, 2], findLastIndex(value => value === 2));
|
|
* // => 3
|
|
*/
|
|
function findLastIndex(predicate) {
|
|
return function(array) {
|
|
for (let index = array.length - 1; index >= 0; index--) if (predicate(array[index], index, array)) return index;
|
|
return -1;
|
|
};
|
|
}
|
|
//#endregion
|
|
exports.findLastIndex = findLastIndex;
|