@reactivex/ix-es2015-cjs
Version:
The Interactive Extensions for JavaScript
47 lines (45 loc) • 2.05 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.last = void 0;
const tslib_1 = require("tslib");
const withabort_js_1 = require("./operators/withabort.js");
const aborterror_js_1 = require("../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.
*/
function last(source, options) {
var _a, e_1, _b, _c;
return tslib_1.__awaiter(this, void 0, void 0, function* () {
const { ['signal']: signal, ['thisArg']: thisArg, ['predicate']: predicate = () => tslib_1.__awaiter(this, void 0, void 0, function* () { return true; }) } = options || {};
(0, aborterror_js_1.throwIfAborted)(signal);
let i = 0;
let result;
try {
for (var _d = true, _e = tslib_1.__asyncValues((0, withabort_js_1.wrapWithAbort)(source, signal)), _f; _f = yield _e.next(), _a = _f.done, !_a; _d = true) {
_c = _f.value;
_d = false;
const item = _c;
if (yield predicate.call(thisArg, item, i++, signal)) {
result = item;
}
}
}
catch (e_1_1) { e_1 = { error: e_1_1 }; }
finally {
try {
if (!_d && !_a && (_b = _e.return)) yield _b.call(_e);
}
finally { if (e_1) throw e_1.error; }
}
return result;
});
}
exports.last = last;
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