@reactivex/ix-es5-esm
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The Interactive Extensions for JavaScript
90 lines (88 loc) • 3.94 kB
JavaScript
import { __asyncGenerator, __asyncValues, __await, __extends, __generator } from "tslib";
import { AsyncIterableX } from '../asynciterablex.js';
import { wrapWithAbort } from './withabort.js';
import { throwIfAborted } from '../../aborterror.js';
/** @ignore */
var DefaultIfEmptyAsyncIterable = /** @class */ (function (_super) {
__extends(DefaultIfEmptyAsyncIterable, _super);
function DefaultIfEmptyAsyncIterable(source, defaultValue) {
var _this = _super.call(this) || this;
_this._source = source;
_this._defaultValue = defaultValue;
return _this;
}
DefaultIfEmptyAsyncIterable.prototype[Symbol.asyncIterator] = function (signal) {
return __asyncGenerator(this, arguments, function _a() {
var state, _b, _c, _d, item, e_1_1;
var _e, e_1, _f, _g;
return __generator(this, function (_h) {
switch (_h.label) {
case 0:
throwIfAborted(signal);
state = 1;
_h.label = 1;
case 1:
_h.trys.push([1, 8, 9, 14]);
_b = true, _c = __asyncValues(wrapWithAbort(this._source, signal));
_h.label = 2;
case 2: return [4 /*yield*/, __await(_c.next())];
case 3:
if (!(_d = _h.sent(), _e = _d.done, !_e)) return [3 /*break*/, 7];
_g = _d.value;
_b = false;
item = _g;
state = 2;
return [4 /*yield*/, __await(item)];
case 4: return [4 /*yield*/, _h.sent()];
case 5:
_h.sent();
_h.label = 6;
case 6:
_b = true;
return [3 /*break*/, 2];
case 7: return [3 /*break*/, 14];
case 8:
e_1_1 = _h.sent();
e_1 = { error: e_1_1 };
return [3 /*break*/, 14];
case 9:
_h.trys.push([9, , 12, 13]);
if (!(!_b && !_e && (_f = _c.return))) return [3 /*break*/, 11];
return [4 /*yield*/, __await(_f.call(_c))];
case 10:
_h.sent();
_h.label = 11;
case 11: return [3 /*break*/, 13];
case 12:
if (e_1) throw e_1.error;
return [7 /*endfinally*/];
case 13: return [7 /*endfinally*/];
case 14:
if (!(state === 1)) return [3 /*break*/, 17];
return [4 /*yield*/, __await(this._defaultValue)];
case 15: return [4 /*yield*/, _h.sent()];
case 16:
_h.sent();
_h.label = 17;
case 17: return [2 /*return*/];
}
});
});
};
return DefaultIfEmptyAsyncIterable;
}(AsyncIterableX));
export { DefaultIfEmptyAsyncIterable };
/**
* Returns the elements of the specified sequence or the default value in a singleton sequence
* if the sequence is empty.
*
* @template T The type of elements in the source sequence.
* @param {T} defaultValue The value to return if the sequence is empty.
* @returns {MonoTypeOperatorAsyncFunction<T>} An operator which returns the elements of the source sequence or the default value as a singleton.
*/
export function defaultIfEmpty(defaultValue) {
return function defaultIfEmptyOperatorFunction(source) {
return new DefaultIfEmptyAsyncIterable(source, defaultValue);
};
}
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