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

import { IterableX } from './iterablex';
import { isIterable } from '../internal/isiterable';
export class FlattenIterable extends IterableX {
    constructor(source, depth) {
        super();
        this._source = source;
        this._depth = depth;
    }
    *_flatten(source, depth) {
        if (depth === 0) {
            for (let item of source) {
                yield item;
            }
            return undefined;
        }
        for (let item of source) {
            if (isIterable(item)) {
                for (let innerItem of this._flatten(item, depth - 1)) {
                    yield innerItem;
                }
            }
            else {
                yield item;
            }
        }
    }
    [Symbol.iterator]() {
        return this._flatten(this._source, this._depth)[Symbol.iterator]();
    }
}
/**
 * Flattens the source sequence until the specified depth.
 * @param {Iterable<T>} source Source sequence.
 * @param {Number} depth The depth to flatten the source sequence.
 * @returns {Iterable<T>} The flattened sequence, flattened to the specified depth.
 */
export function flatten(source, depth = Infinity) {
    return new FlattenIterable(source, depth);
}

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