@reactivex/ix-esnext-esm/iterable/operators/expand.js

The Interactive Extensions for JavaScript

import { IterableX } from '../iterablex';
export class ExpandIterable extends IterableX {
    constructor(source, fn) {
        super();
        this._source = source;
        this._fn = fn;
    }
    *[Symbol.iterator]() {
        const q = [this._source];
        while (q.length > 0) {
            const src = q.shift();
            for (const item of src) {
                q.push(this._fn(item));
                yield item;
            }
        }
    }
}
export function expand(selector) {
    return function expandOperatorFunction(source) {
        return new ExpandIterable(source, selector);
    };
}

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