@reactivex/ix-es2015-cjs/asynciterable/_extremaby.js

The Interactive Extensions for JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.extremaBy = void 0;
const tslib_1 = require("tslib");
const aborterror_js_1 = require("../aborterror.js");
const withabort_js_1 = require("./operators/withabort.js");
function extremaBy(source, selector, comparer, signal) {
    return tslib_1.__awaiter(this, void 0, void 0, function* () {
        (0, aborterror_js_1.throwIfAborted)(signal);
        let result = [];
        const it = (0, withabort_js_1.wrapWithAbort)(source, signal)[Symbol.asyncIterator]();
        const { value, done } = yield it.next();
        if (done) {
            throw new Error('Sequence contains no elements');
        }
        let resKey = yield selector(value, signal);
        result.push(value);
        let next;
        while (!(next = yield it.next()).done) {
            const current = next.value;
            const key = yield selector(current, signal);
            const cmp = yield comparer(key, resKey, signal);
            if (cmp === 0) {
                result.push(current);
            }
            else if (cmp > 0) {
                result = [current];
                resKey = key;
            }
        }
        return result;
    });
}
exports.extremaBy = extremaBy;

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