@reactivex/ix-esnext-esm/iterable/zip.js

import { IterableX } from './iterablex';
import { identity } from '../util/identity';
import { returnIterator } from '../util/returniterator';
export class ZipIterable extends IterableX {
    constructor(sources, fn) {
        super();
        this._sources = sources;
        this._fn = fn;
    }
    // eslint-disable-next-line consistent-return
    *[Symbol.iterator]() {
        const fn = this._fn;
        const sourcesLength = this._sources.length;
        const its = this._sources.map(x => x[Symbol.iterator]());
        while (sourcesLength > 0) {
            const values = new Array(sourcesLength);
            for (let index = -1; ++index < sourcesLength;) {
                const result = its[index].next();
                if (result.done) {
                    its.forEach(returnIterator);
                    return undefined;
                }
                values[index] = result.value;
            }
            yield fn(values);
        }
    }
}
export function zip(...sources) {
    let fn = (sources.shift() || identity);
    if (fn && typeof fn !== 'function') {
        sources.unshift(fn);
        fn = identity;
    }
    return new ZipIterable(sources, fn);
}

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