ix/asynciterable/minby.mjs

The Interactive Extensions for JavaScript

import { __awaiter } from "tslib";
import { extremaBy } from './_extremaby.mjs';
import { equalityComparerAsync } from '../util/comparer.mjs';
/**
 * Returns the elements in an async-enumerable sequence with the minimum key value.
 *
 * @template TSource The type of the elements in the source sequence.
 * @template TKey The type of the key computed for each element in the source sequence.
 * @param {AsyncIterable<TSource>} source An async-iterable sequence to get the minimum elements for.
 * @param {ExtremaOptions<TSource, TKey>} options The options which include an optional comparer and abort signal.
 * @returns {Promise<TSource[]>} A promise containing a list of zero or more elements that have a minimum key value.
 */
export function minBy(source, options) {
    const { ['comparer']: comparer = equalityComparerAsync, ['selector']: selector, ['signal']: signal, } = options || {};
    const newComparer = (key, minValue) => __awaiter(this, void 0, void 0, function* () { return -(yield comparer(key, minValue)); });
    return extremaBy(source, selector, newComparer, signal);
}

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