@reactivex/ix-esnext-esm/iterable/min.js

import { equalityComparer } from '../util/comparer';
import { identity } from '../util/identity';
/**
 *  * Returns the minimum element with the optional selector.
 *
 * @export
 * @template TSource The type of the elements in the source sequence.
 * @param {Iterable<TSource>} source An iterable sequence to determine the minimum element of.
 * @param {ExtremaByOptions<TKey>} [options] The options which include an optional comparer.
 * @returns {TResult} The minimum element.
 */
export function min(source, options) {
    const { ['comparer']: comparer = equalityComparer, ['selector']: selector = identity } = options || {};
    const it = source[Symbol.iterator]();
    let next = it.next();
    if (next.done) {
        throw new Error('Sequence contains no elements');
    }
    let minValue = selector(next.value);
    while (!(next = it.next()).done) {
        const current = selector(next.value);
        if (comparer(current, minValue) < 0) {
            minValue = current;
        }
    }
    return minValue;
}

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