ix/asynciterable/max.js

The Interactive Extensions for JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.max = void 0;
const tslib_1 = require("tslib");
const comparer_js_1 = require("../util/comparer.js");
const identity_js_1 = require("../util/identity.js");
const withabort_js_1 = require("./operators/withabort.js");
const aborterror_js_1 = require("../aborterror.js");
/**
 * Returns the maximum element with the optional selector.
 *
 * @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.
 */
function max(source, options) {
    return tslib_1.__awaiter(this, void 0, void 0, function* () {
        const { ['comparer']: comparer = comparer_js_1.equalityComparerAsync, ['signal']: signal, ['selector']: selector = identity_js_1.identityAsync, } = options || {};
        (0, aborterror_js_1.throwIfAborted)(signal);
        const it = (0, withabort_js_1.wrapWithAbort)(source, signal)[Symbol.asyncIterator]();
        let next = yield it.next();
        if (next.done) {
            throw new Error('Sequence contains no elements');
        }
        let maxValue = yield selector(next.value);
        while (!(next = yield it.next()).done) {
            const current = yield selector(next.value);
            if ((yield comparer(current, maxValue)) > 0) {
                maxValue = current;
            }
        }
        return maxValue;
    });
}
exports.max = max;

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