| 1 | import { AsyncIterableX } from './asynciterablex';
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| 2 | import { createGrouping } from './_grouping';
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| 3 | import { empty } from './empty';
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| 4 | import { identity } from '../internal/identity';
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| 5 | export class GroupJoinAsyncIterable extends AsyncIterableX {
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| 6 | constructor(outer, inner, outerSelector, innerSelector, resultSelector) {
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| 7 | super();
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| 8 | this._outer = outer;
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| 9 | this._inner = inner;
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| 10 | this._outerSelector = outerSelector;
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| 11 | this._innerSelector = innerSelector;
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| 12 | this._resultSelector = resultSelector;
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| 13 | }
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| 14 | async *[Symbol.asyncIterator]() {
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| 15 | const map = await createGrouping(this._inner, this._innerSelector, identity);
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| 16 | for await (let outerElement of this._outer) {
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| 17 | const outerKey = await this._outerSelector(outerElement);
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| 18 | const innerElements = map.has(outerKey)
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| 19 | ? map.get(outerKey)
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| 20 | : empty();
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| 21 | yield await this._resultSelector(outerElement, AsyncIterableX.from(innerElements));
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| 22 | }
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| 23 | }
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| 24 | }
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| 25 | export function groupJoin(outer, inner, outerSelector, innerSelector, resultSelector) {
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| 26 | return new GroupJoinAsyncIterable(outer, inner, outerSelector, innerSelector, resultSelector);
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| 27 | }
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| 28 |
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| 29 |
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