40 lines
1.8 KiB
JavaScript
40 lines
1.8 KiB
JavaScript
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import { identity } from "../../function/identity.mjs";
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import { toArray } from "../_internal/toArray.mjs";
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import { property } from "../object/property.mjs";
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import { matches } from "../predicate/matches.mjs";
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import { matchesProperty } from "../predicate/matchesProperty.mjs";
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//#region src/compat/array/findLastIndex.ts
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/**
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* Finds the index of the last element in the array that satisfies the predicate.
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*
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* @template T
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* @param {ArrayLike<T> | null | undefined} arr - The array to search through.
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* @param {((item: T, index: number, arr: any) => unknown) | Partial<T> | [keyof T, unknown] | PropertyKey} doesMatch - The predicate function, partial object, property-value pair, or property name.
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* @param {number} [fromIndex=arr.length - 1] - The index to start the search from, defaults to the last index of the array.
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* @returns {number} The index of the last matching element, or -1 if not found.
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*
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* @example
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* const items = [{ id: 1, name: 'Alice' }, { id: 2, name: 'Bob' }];
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* findLastIndex(items, 'name');
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* // => 1
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*/
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function findLastIndex(arr, doesMatch = identity, fromIndex = arr ? arr.length - 1 : 0) {
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if (!arr) return -1;
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if (fromIndex < 0) fromIndex = Math.max(arr.length + fromIndex, 0);
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else fromIndex = Math.min(fromIndex, arr.length - 1);
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const subArray = toArray(arr).slice(0, fromIndex + 1);
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switch (typeof doesMatch) {
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case "function": return subArray.findLastIndex(doesMatch);
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case "object": if (Array.isArray(doesMatch) && doesMatch.length === 2) {
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const key = doesMatch[0];
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const value = doesMatch[1];
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return subArray.findLastIndex(matchesProperty(key, value));
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} else return subArray.findLastIndex(matches(doesMatch));
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case "number":
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case "symbol":
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case "string": return subArray.findLastIndex(property(doesMatch));
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}
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}
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//#endregion
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export { findLastIndex };
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