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

The Interactive Extensions for JavaScript

import { AsyncIterableX } from '../asynciterablex';
import { createGrouping } from './_grouping';
import { empty } from '../empty';
import { from } from '../from';
import { identity } from '../../util/identity';
export class GroupJoinAsyncIterable extends AsyncIterableX {
    constructor(outer, inner, outerSelector, innerSelector, resultSelector) {
        super();
        this._outer = outer;
        this._inner = inner;
        this._outerSelector = outerSelector;
        this._innerSelector = innerSelector;
        this._resultSelector = resultSelector;
    }
    async *[Symbol.asyncIterator]() {
        const map = await createGrouping(this._inner, this._innerSelector, identity);
        for await (const outerElement of this._outer) {
            const outerKey = await this._outerSelector(outerElement);
            const innerElements = map.has(outerKey)
                ? map.get(outerKey)
                : empty();
            yield await this._resultSelector(outerElement, from(innerElements));
        }
    }
}
export function groupJoin(inner, outerSelector, innerSelector, resultSelector) {
    return function groupJoinOperatorFunction(outer) {
        return new GroupJoinAsyncIterable(outer, inner, outerSelector, innerSelector, resultSelector);
    };
}

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