@reactivex/ix-es5-esm/asynciterable/_extremaby.js

The Interactive Extensions for JavaScript

import { __awaiter, __generator } from "tslib";
import { throwIfAborted } from '../aborterror.js';
import { wrapWithAbort } from './operators/withabort.js';
export function extremaBy(source, selector, comparer, signal) {
    return __awaiter(this, void 0, void 0, function () {
        var result, it, _a, value, done, resKey, next, current, key, cmp;
        return __generator(this, function (_b) {
            switch (_b.label) {
                case 0:
                    throwIfAborted(signal);
                    result = [];
                    it = wrapWithAbort(source, signal)[Symbol.asyncIterator]();
                    return [4 /*yield*/, it.next()];
                case 1:
                    _a = _b.sent(), value = _a.value, done = _a.done;
                    if (done) {
                        throw new Error('Sequence contains no elements');
                    }
                    return [4 /*yield*/, selector(value, signal)];
                case 2:
                    resKey = _b.sent();
                    result.push(value);
                    _b.label = 3;
                case 3: return [4 /*yield*/, it.next()];
                case 4:
                    if (!!(next = _b.sent()).done) return [3 /*break*/, 7];
                    current = next.value;
                    return [4 /*yield*/, selector(current, signal)];
                case 5:
                    key = _b.sent();
                    return [4 /*yield*/, comparer(key, resKey, signal)];
                case 6:
                    cmp = _b.sent();
                    if (cmp === 0) {
                        result.push(current);
                    }
                    else if (cmp > 0) {
                        result = [current];
                        resKey = key;
                    }
                    return [3 /*break*/, 3];
                case 7: return [2 /*return*/, result];
            }
        });
    });
}

//# sourceMappingURL=_extremaby.js.map