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

The Interactive Extensions for JavaScript

import { AsyncIterableX } from '../asynciterable';
import { bindCallback } from '../util/bindcallback';
class MapAsyncIterable extends AsyncIterableX {
    constructor(source, selector) {
        super();
        this._source = source;
        this._selector = selector;
    }
    async *[Symbol.asyncIterator]() {
        let i = 0;
        for await (const item of this._source) {
            yield await this._selector(item, i++);
        }
    }
}
export function mapAsync(source, selector, thisArg) {
    return new MapAsyncIterable(source, bindCallback(selector, thisArg, 2));
}

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