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

import { equalityComparerAsync } from '../util/comparer';
import { identityAsync } from '../util/identity';
import { wrapWithAbort } from './operators/withabort';
import { throwIfAborted } from '../aborterror';
/**
 * Returns the maximum element with the optional selector.
 *
 * @export
 * @template TSource The type of the elements in the source sequence.
 * @param {AsyncIterable<TSource>} source An async-iterable sequence to determine the maximum element of.
 * @param {ExtremaByOptions<TKey>} [options] The options which include an optional comparer and abort signal.
 * @returns {Promise<TResult>} The maximum element.
 */
export async function max(source, options) {
    const { ['comparer']: comparer = equalityComparerAsync, ['signal']: signal, ['selector']: selector = identityAsync, } = options || {};
    throwIfAborted(signal);
    const it = wrapWithAbort(source, signal)[Symbol.asyncIterator]();
    let next = await it.next();
    if (next.done) {
        throw new Error('Sequence contains no elements');
    }
    let maxValue = await selector(next.value);
    while (!(next = await it.next()).done) {
        const current = await selector(next.value);
        if ((await comparer(current, maxValue)) > 0) {
            maxValue = current;
        }
    }
    return maxValue;
}

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