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

The Interactive Extensions for JavaScript

import { __awaiter, __generator } from "tslib";
import { defer } from './defer.js';
import { empty } from './empty.js';
/**
 * If the specified condition evaluates true, select the thenSource sequence.
 * Otherwise, select the elseSource sequence.
 *
 * @template TSource The type of the elements in the result sequence.
 * @param {((signal?: AbortSignal) => boolean | Promise<boolean>)} condition Condition evaluated to decide which sequence to return.
 * @param {AsyncIterable<TSource>} thenSource Sequence returned in case evaluates true.
 * @param {AsyncIterable<TSource>} [elseSource=empty()] Sequence returned in case condition evaluates false.
 * @returns {AsyncIterableX<TSource>} thenSource if condition evaluates true; elseSource otherwise.
 */
export function iif(condition, thenSource, elseSource) {
    var _this = this;
    if (elseSource === void 0) { elseSource = empty(); }
    return defer(function (signal) { return __awaiter(_this, void 0, void 0, function () { return __generator(this, function (_a) {
        switch (_a.label) {
            case 0: return [4 /*yield*/, condition(signal)];
            case 1: return [2 /*return*/, ((_a.sent()) ? thenSource : elseSource)];
        }
    }); }); });
}

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