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

The Interactive Extensions for JavaScript

import { AsyncIterableX } from './../asynciterablex';
import { identityAsync } from '../../util/identity';
import { arrayIndexOfAsync } from '../../util/arrayindexof';
import { comparerAsync } from '../../util/comparer';
export class DistinctAsyncIterable extends AsyncIterableX {
    constructor(source, keySelector, comparer) {
        super();
        this._source = source;
        this._keySelector = keySelector;
        this._comparer = comparer;
    }
    async *[Symbol.asyncIterator]() {
        const set = [];
        for await (const item of this._source) {
            const key = await this._keySelector(item);
            if ((await arrayIndexOfAsync(set, key, this._comparer)) === -1) {
                set.push(key);
                yield item;
            }
        }
    }
}
export function distinct(keySelector = identityAsync, comparer = comparerAsync) {
    return function distinctOperatorFunction(source) {
        return new DistinctAsyncIterable(source, keySelector, comparer);
    };
}

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