@reactivex/ix-es5-esm/asynciterable/last.js

The Interactive Extensions for JavaScript

import { __asyncValues, __awaiter, __generator } from "tslib";
import { wrapWithAbort } from './operators/withabort.js';
import { throwIfAborted } from '../aborterror.js';
/**
 * Returns the last element of an async-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 {AsyncIterable<T>} source The source async-iterable sequence.
 * @param {OptionalFindOptions<T, S>} [options] The options which include an optional predicate for filtering,
 * thirArg for binding, and abort signal for cancellation
 * @returns {(Promise<S | undefined>)} A promise containing the last value that matches the optional predicate or last item, otherwise undefined.
 */
export function last(source, options) {
    var _a, e_1, _b, _c;
    return __awaiter(this, void 0, void 0, function () {
        var _d, signal, thisArg, _e, predicate, i, result, _f, _g, _h, item, e_1_1;
        var _this = this;
        return __generator(this, function (_j) {
            switch (_j.label) {
                case 0:
                    _d = options || {}, signal = _d["signal"], thisArg = _d["thisArg"], _e = _d["predicate"], predicate = _e === void 0 ? function () { return __awaiter(_this, void 0, void 0, function () { return __generator(this, function (_a) {
                        return [2 /*return*/, true];
                    }); }); } : _e;
                    throwIfAborted(signal);
                    i = 0;
                    _j.label = 1;
                case 1:
                    _j.trys.push([1, 7, 8, 13]);
                    _f = true, _g = __asyncValues(wrapWithAbort(source, signal));
                    _j.label = 2;
                case 2: return [4 /*yield*/, _g.next()];
                case 3:
                    if (!(_h = _j.sent(), _a = _h.done, !_a)) return [3 /*break*/, 6];
                    _c = _h.value;
                    _f = false;
                    item = _c;
                    return [4 /*yield*/, predicate.call(thisArg, item, i++, signal)];
                case 4:
                    if (_j.sent()) {
                        result = item;
                    }
                    _j.label = 5;
                case 5:
                    _f = true;
                    return [3 /*break*/, 2];
                case 6: return [3 /*break*/, 13];
                case 7:
                    e_1_1 = _j.sent();
                    e_1 = { error: e_1_1 };
                    return [3 /*break*/, 13];
                case 8:
                    _j.trys.push([8, , 11, 12]);
                    if (!(!_f && !_a && (_b = _g.return))) return [3 /*break*/, 10];
                    return [4 /*yield*/, _b.call(_g)];
                case 9:
                    _j.sent();
                    _j.label = 10;
                case 10: return [3 /*break*/, 12];
                case 11:
                    if (e_1) throw e_1.error;
                    return [7 /*endfinally*/];
                case 12: return [7 /*endfinally*/];
                case 13: return [2 /*return*/, result];
            }
        });
    });
}

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