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

The Interactive Extensions for JavaScript

import { comparer } from '../util/comparer';
import { wrapWithAbort } from './operators/withabort';
import { throwIfAborted } from '../aborterror';
/**
 *  Determines whether an async-itreable includes a certain value among its entries, returning true or false as appropriate.
 *
 * @export
 * @template T The type of elements in the source sequence.
 * @param {AsyncIterable<T>} source The source sequence to search for the item.
 * @param {T} valueToFind The value to search for.
 * @param {number} [fromIndex=0] The position in this async-iterable at which to begin searching for valueToFind.
 * @param {AbortSignal} [signal] An optional abort signal to cancel the operation at any time.
 * @returns {Promise<boolean>} Returns a promise containing true if the value valueToFind is found within the async-iterable.
 */
export async function includes(source, valueToFind, fromIndex = 0, signal) {
    throwIfAborted(signal);
    let fromIdx = fromIndex;
    let i = 0;
    if (Math.abs(fromIdx)) {
        fromIdx = 0;
    }
    for await (const item of wrapWithAbort(source, signal)) {
        if (i++ > fromIdx && comparer(item, valueToFind)) {
            return true;
        }
    }
    return false;
}

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