@reactivex/ix-es2015-cjs
Version:
The Interactive Extensions for JavaScript
63 lines (61 loc) • 2.5 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.takeLast = exports.TakeLastAsyncIterable = void 0;
const tslib_1 = require("tslib");
const asynciterablex_js_1 = require("../asynciterablex.js");
const withabort_js_1 = require("./withabort.js");
const aborterror_js_1 = require("../../aborterror.js");
/** @ignore */
class TakeLastAsyncIterable extends asynciterablex_js_1.AsyncIterableX {
constructor(source, count) {
super();
this._source = source;
this._count = count;
}
[Symbol.asyncIterator](signal) {
return tslib_1.__asyncGenerator(this, arguments, function* _a() {
var _b, e_1, _c, _d;
(0, aborterror_js_1.throwIfAborted)(signal);
if (this._count > 0) {
const q = [];
try {
for (var _e = true, _f = tslib_1.__asyncValues((0, withabort_js_1.wrapWithAbort)(this._source, signal)), _g; _g = yield tslib_1.__await(_f.next()), _b = _g.done, !_b; _e = true) {
_d = _g.value;
_e = false;
const item = _d;
if (q.length >= this._count) {
q.shift();
}
q.push(item);
}
}
catch (e_1_1) { e_1 = { error: e_1_1 }; }
finally {
try {
if (!_e && !_b && (_c = _f.return)) yield tslib_1.__await(_c.call(_f));
}
finally { if (e_1) throw e_1.error; }
}
while (q.length > 0) {
yield yield tslib_1.__await(q.shift());
}
}
});
}
}
exports.TakeLastAsyncIterable = TakeLastAsyncIterable;
/**
* Returns a specified number of contiguous elements from the end of an async-iterable sequence.
*
* @template TSource The type of the elements in the source sequence.
* @param {number} count Number of elements to take from the end of the source sequence.
* @returns {MonoTypeOperatorAsyncFunction<TSource>} An async-iterable sequence containing the specified
* number of elements from the end of the source sequence.
*/
function takeLast(count) {
return function takeLastOperatorFunction(source) {
return new TakeLastAsyncIterable(source, count);
};
}
exports.takeLast = takeLast;
//# sourceMappingURL=takelast.js.map