ix/asynciterable/zip.js

The Interactive Extensions for JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.zip = exports.ZipAsyncIterable = void 0;
const tslib_1 = require("tslib");
const withabort_js_1 = require("./operators/withabort.js");
const asynciterablex_js_1 = require("./asynciterablex.js");
const returniterator_js_1 = require("../util/returniterator.js");
const aborterror_js_1 = require("../aborterror.js");
/** @ignore */
class ZipAsyncIterable extends asynciterablex_js_1.AsyncIterableX {
    constructor(sources) {
        super();
        this._sources = sources;
    }
    // eslint-disable-next-line consistent-return
    [Symbol.asyncIterator](signal) {
        return tslib_1.__asyncGenerator(this, arguments, function* _a() {
            (0, aborterror_js_1.throwIfAborted)(signal);
            const sourcesLength = this._sources.length;
            const its = this._sources.map((x) => (0, withabort_js_1.wrapWithAbort)(x, signal)[Symbol.asyncIterator]());
            while (sourcesLength > 0) {
                const values = new Array(sourcesLength);
                for (let i = -1; ++i < sourcesLength;) {
                    const { value, done } = yield tslib_1.__await(its[i].next());
                    if (done) {
                        yield tslib_1.__await(Promise.all(its.map(returniterator_js_1.returnAsyncIterator)));
                        return yield tslib_1.__await(undefined);
                    }
                    values[i] = value;
                }
                yield yield tslib_1.__await(values);
            }
        });
    }
}
exports.ZipAsyncIterable = ZipAsyncIterable;
function zip(...sources) {
    return new ZipAsyncIterable(sources);
}
exports.zip = zip;

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