@reactivex/ix-es5-esm/asynciterable/operators/scanright.js

The Interactive Extensions for JavaScript

import { __asyncGenerator, __await, __extends, __generator } from "tslib";
import { AsyncIterableX } from '../asynciterablex.js';
import { toArray } from '../toarray.js';
import { throwIfAborted } from '../../aborterror.js';
/** @ignore */
var ScanRightAsyncIterable = /** @class */ (function (_super) {
    __extends(ScanRightAsyncIterable, _super);
    function ScanRightAsyncIterable(source, options) {
        var _this = _super.call(this) || this;
        _this._source = source;
        _this._fn = options['callback'];
        _this._hasSeed = options.hasOwnProperty('seed');
        _this._seed = options['seed'];
        return _this;
    }
    ScanRightAsyncIterable.prototype[Symbol.asyncIterator] = function (signal) {
        return __asyncGenerator(this, arguments, function _a() {
            var hasValue, acc, source, offset, item;
            return __generator(this, function (_b) {
                switch (_b.label) {
                    case 0:
                        throwIfAborted(signal);
                        hasValue = false;
                        acc = this._seed;
                        return [4 /*yield*/, __await(toArray(this._source, signal))];
                    case 1:
                        source = _b.sent();
                        offset = source.length - 1;
                        _b.label = 2;
                    case 2:
                        if (!(offset >= 0)) return [3 /*break*/, 8];
                        item = source[offset];
                        if (!(hasValue || (hasValue = this._hasSeed))) return [3 /*break*/, 6];
                        return [4 /*yield*/, __await(this._fn(acc, item, offset, signal))];
                    case 3:
                        acc = _b.sent();
                        return [4 /*yield*/, __await(acc)];
                    case 4: return [4 /*yield*/, _b.sent()];
                    case 5:
                        _b.sent();
                        return [3 /*break*/, 7];
                    case 6:
                        acc = item;
                        hasValue = true;
                        _b.label = 7;
                    case 7:
                        offset--;
                        return [3 /*break*/, 2];
                    case 8: return [2 /*return*/];
                }
            });
        });
    };
    return ScanRightAsyncIterable;
}(AsyncIterableX));
export { ScanRightAsyncIterable };
/**
 * Applies an accumulator function over an async-iterable sequence from the right and returns each intermediate result.
 * The specified seed value, if given, is used as the initial accumulator value.
 *
 * @template T The type of the elements in the source sequence.
 * @template R The type of the result of the aggregation.
 * @param {ScanOptions<T, R>} options The options including the accumulator function and seed.
 * @returns {OperatorAsyncFunction<T, R>} An async-enumerable sequence containing the accumulated values from the right.
 */
export function scanRight(options) {
    return function scanRightOperatorFunction(source) {
        return new ScanRightAsyncIterable(source, options);
    };
}

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