@reactivex/ix-es5-esm/iterable/operators/groupjoin.js

The Interactive Extensions for JavaScript

import { __extends, __generator, __values } from "tslib";
import { IterableX } from '../iterablex.js';
import { createGrouping } from './_grouping.js';
import { empty } from '../empty.js';
import { identity } from '../../util/identity.js';
/** @ignore */
var GroupJoinIterable = /** @class */ (function (_super) {
    __extends(GroupJoinIterable, _super);
    function GroupJoinIterable(outer, inner, outerSelector, innerSelector, resultSelector) {
        var _this = _super.call(this) || this;
        _this._outer = outer;
        _this._inner = inner;
        _this._outerSelector = outerSelector;
        _this._innerSelector = innerSelector;
        _this._resultSelector = resultSelector;
        return _this;
    }
    GroupJoinIterable.prototype[Symbol.iterator] = function () {
        var map, _a, _b, outerElement, outerKey, innerElements, e_1_1;
        var e_1, _c;
        return __generator(this, function (_d) {
            switch (_d.label) {
                case 0:
                    map = createGrouping(this._inner, this._innerSelector, identity);
                    _d.label = 1;
                case 1:
                    _d.trys.push([1, 6, 7, 8]);
                    _a = __values(this._outer), _b = _a.next();
                    _d.label = 2;
                case 2:
                    if (!!_b.done) return [3 /*break*/, 5];
                    outerElement = _b.value;
                    outerKey = this._outerSelector(outerElement);
                    innerElements = map.has(outerKey) ? map.get(outerKey) : empty();
                    return [4 /*yield*/, this._resultSelector(outerElement, innerElements)];
                case 3:
                    _d.sent();
                    _d.label = 4;
                case 4:
                    _b = _a.next();
                    return [3 /*break*/, 2];
                case 5: return [3 /*break*/, 8];
                case 6:
                    e_1_1 = _d.sent();
                    e_1 = { error: e_1_1 };
                    return [3 /*break*/, 8];
                case 7:
                    try {
                        if (_b && !_b.done && (_c = _a.return)) _c.call(_a);
                    }
                    finally { if (e_1) throw e_1.error; }
                    return [7 /*endfinally*/];
                case 8: return [2 /*return*/];
            }
        });
    };
    return GroupJoinIterable;
}(IterableX));
export { GroupJoinIterable };
/**
 * Correlates the elements of two iterable sequences based on equality of keys and groups the results.
 *
 * @template TOuter The type of the elements of the first iterable sequence.
 * @template TInner The type of the elements of the second iterable sequence.
 * @template TKey The type of the keys returned by the key selector functions.
 * @template TResult The type of the result elements.
 * @param {Iterable<TInner>} inner The async-enumerable sequence to join to the first sequence.
 * @param {((value: TOuter) => TKey)} outerSelector A function to extract the join key from each
 * element of the first sequence.
 * @param {((value: TInner) => TKey)} innerSelector A function to extract the join key from each
 * element of the second sequence.
 * @param {((outer: TOuter, inner: Iterable<TInner>) => TResult)} resultSelector A function to create a result
 * element from an element from the first sequence and a collection of matching elements from the second sequence.
 * @returns {OperatorFunction<TOuter, TResult>} An operator that returns an iterable sequence that contains the result elements
 * that are obtained by performing a grouped join on two sequences.
 */
export function groupJoin(inner, outerSelector, innerSelector, resultSelector) {
    return function groupJoinOperatorFunction(outer) {
        return new GroupJoinIterable(outer, inner, outerSelector, innerSelector, resultSelector);
    };
}

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