@reactivex/ix-esnext-esm/asynciterable/operators/innerjoin.mjs.map

The Interactive Extensions for JavaScript

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{ AsyncIterableX } from '../asynciterablex';\nimport { createGrouping } from './_grouping';\nimport { identity } from '../../util/identity';\nimport { OperatorAsyncFunction } from '../../interfaces';\nimport { wrapWithAbort } from './withabort';\nimport { throwIfAborted } from '../../aborterror';\n\nexport class JoinAsyncIterable<TOuter, TInner, TKey, TResult> extends AsyncIterableX<TResult> {\n  private _outer: AsyncIterable<TOuter>;\n  private _inner: AsyncIterable<TInner>;\n  private _outerSelector: (value: TOuter, signal?: AbortSignal) => TKey | Promise<TKey>;\n  private _innerSelector: (value: TInner, signal?: AbortSignal) => TKey | Promise<TKey>;\n  private _resultSelector: (\n    outer: TOuter,\n    inner: TInner,\n    signal?: AbortSignal\n  ) => TResult | Promise<TResult>;\n\n  constructor(\n    outer: AsyncIterable<TOuter>,\n    inner: AsyncIterable<TInner>,\n    outerSelector: (value: TOuter, signal?: AbortSignal) => TKey | Promise<TKey>,\n    innerSelector: (value: TInner, signal?: AbortSignal) => TKey | Promise<TKey>,\n    resultSelector: (\n      outer: TOuter,\n      inner: TInner,\n      signal?: AbortSignal\n    ) => TResult | Promise<TResult>\n  ) {\n    super();\n    this._outer = outer;\n    this._inner = inner;\n    this._outerSelector = outerSelector;\n    this._innerSelector = innerSelector;\n    this._resultSelector = resultSelector;\n  }\n\n  async *[Symbol.asyncIterator](signal?: AbortSignal) {\n    throwIfAborted(signal);\n    const map = await createGrouping(this._inner, this._innerSelector, identity, signal);\n    for await (const outerElement of wrapWithAbort(this._outer, signal)) {\n      const outerKey = await this._outerSelector(outerElement, signal);\n      if (map.has(outerKey)) {\n        for (const innerElement of map.get(outerKey)!) {\n          yield await this._resultSelector(outerElement, innerElement, signal);\n        }\n      }\n    }\n  }\n}\n\n/**\n * Correlates the elements of two sequences based on matching keys.\n *\n * @export\n * @template TOuter The type of the elements of the first async-iterable sequence.\n * @template TInner The type of the elements of the second async-iterable sequence.\n * @template TKey The type of the keys returned by the key selector functions.\n * @template TResult The type of the result elements.\n * @param {AsyncIterable<TInner>} inner The async-enumerable sequence to join to the first sequence.\n * @param {((value: TOuter, signal?: AbortSignal) => TKey | Promise<TKey>)} outerSelector A function to extract the join key from each element\n * of the first sequence.\n * @param {((value: TInner, signal?: AbortSignal) => TKey | Promise<TKey>)} innerSelector A function to extract the join key from each element\n * of the second sequence.\n * @param {((outer: TOuter, inner: TInner, signal?: AbortSignal) => TResult | Promise<TResult>)} resultSelector A function to create a result element\n * from two matching elements.\n * @returns {OperatorAsyncFunction<TOuter, TResult>} An async-iterable sequence that has elements that are obtained by performing an inner join\n * on two sequences.\n */\nexport function innerJoin<TOuter, TInner, TKey, TResult>(\n  inner: AsyncIterable<TInner>,\n  outerSelector: (value: TOuter, signal?: AbortSignal) => TKey | Promise<TKey>,\n  innerSelector: (value: TInner, signal?: AbortSignal) => TKey | Promise<TKey>,\n  resultSelector: (outer: TOuter, inner: TInner, signal?: AbortSignal) => TResult | Promise<TResult>\n): OperatorAsyncFunction<TOuter, TResult> {\n  return function innerJoinOperatorFunction(outer: AsyncIterable<TOuter>): AsyncIterableX<TResult> {\n    return new JoinAsyncIterable<TOuter, TInner, TKey, TResult>(\n      outer,\n      inner,\n      outerSelector,\n      innerSelector,\n      resultSelector\n    );\n  };\n}\n"]}