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

The Interactive Extensions for JavaScript

import { defer } from './defer';
import { empty } from './empty';
/**
 * If the specified condition evaluates true, select the thenSource sequence.
 * Otherwise, select the elseSource sequence.
 *
 * @export
 * @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 = empty()) {
    return defer(async (signal) => ((await condition(signal)) ? thenSource : elseSource));
}

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