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

The Interactive Extensions for JavaScript

import { throwIfAborted } from '../aborterror.js';
import { wrapWithAbort } from './operators/withabort.js';
export async function extremaBy(source, selector, comparer, signal) {
    throwIfAborted(signal);
    let result = [];
    const it = wrapWithAbort(source, signal)[Symbol.asyncIterator]();
    const { value, done } = await it.next();
    if (done) {
        throw new Error('Sequence contains no elements');
    }
    let resKey = await selector(value, signal);
    result.push(value);
    let next;
    while (!(next = await it.next()).done) {
        const current = next.value;
        const key = await selector(current, signal);
        const cmp = await comparer(key, resKey, signal);
        if (cmp === 0) {
            result.push(current);
        }
        else if (cmp > 0) {
            result = [current];
            resKey = key;
        }
    }
    return result;
}

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