@reactivex/ix-esnext-esm/asynciterable/operators/except.js

The Interactive Extensions for JavaScript

import { AsyncIterableX } from '../asynciterablex';
import { arrayIndexOfAsync } from '../../util/arrayindexof';
import { comparerAsync } from '../../util/comparer';
import { wrapWithAbort } from './withabort';
import { throwIfAborted } from '../../aborterror';
export class ExceptAsyncIterable extends AsyncIterableX {
    constructor(first, second, comparer) {
        super();
        this._first = first;
        this._second = second;
        this._comparer = comparer;
    }
    async *[Symbol.asyncIterator](signal) {
        throwIfAborted(signal);
        const map = [];
        for await (const secondItem of wrapWithAbort(this._second, signal)) {
            map.push(secondItem);
        }
        for await (const firstItem of wrapWithAbort(this._first, signal)) {
            if ((await arrayIndexOfAsync(map, firstItem, this._comparer)) === -1) {
                map.push(firstItem);
                yield firstItem;
            }
        }
    }
}
/**
 *  Produces the set difference of two async-iterable sequences by using the specified equality comparer to compare values.
 *
 * @export
 * @template TSource The type of the elements of the input sequences.
 * @param {AsyncIterable<TSource>} second An async-iterable sequence whose elements that also occur in the
 * operator sequence will cause those elements to be removed from the returned sequence.
 * @param {((x: TSource, y: TSource) => boolean | Promise<boolean>)} [comparer=comparerAsync] An equality comparer to compare values
 * @returns {MonoTypeOperatorAsyncFunction<TSource>} An operator that returns a sequence that contains the set
 * difference of the elements of two sequences.
 */
export function except(second, comparer = comparerAsync) {
    return function exceptOperatorFunction(first) {
        return new ExceptAsyncIterable(first, second, comparer);
    };
}

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