ix/iterable/last.js

The Interactive Extensions for JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.last = void 0;
/**
 * Returns the last element of an iterable sequence that satisfies the condition in the predicate if given
 * otherwise the last item in the sequence, or a default value if no such element exists.
 *
 * @template T The type of elements in the source sequence.
 * @param {Iterable<T>} source The source iterable sequence.
 * @param {OptionalFindSubclassedOptions<T, S>} [options] The options which include an optional predicate for filtering,
 * thirArg for binding, and abort signal for cancellation
 * @returns {(S | undefined)} The last value that matches the optional predicate or last item, otherwise undefined.
 */
function last(source, options) {
    const { ['thisArg']: thisArg, ['predicate']: predicate = () => true } = options || {};
    let i = 0;
    let result;
    for (const item of source) {
        if (predicate.call(thisArg, item, i++)) {
            result = item;
        }
    }
    return result;
}
exports.last = last;

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