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