ix/iterable/operators/share.mjs

The Interactive Extensions for JavaScript

import { IterableX } from '../iterablex.mjs';
import { create } from '../create.mjs';
class SharedIterable extends IterableX {
    constructor(it) {
        super();
        this._it = {
            next(value) {
                return it.next(value);
            },
        };
    }
    [Symbol.iterator]() {
        return this._it;
    }
}
/**
 * Shares the source sequence within a selector function where each iterator can fetch the next element from the
 * source sequence.
 *
 * @template TSource Source sequence element type.
 * @template TResult Result sequence element type.
 * @param {((value: Iterable<TSource>) => Iterable<TResult>)} [selector] Selector function with shared access
 * to the source sequence for each iterator.
 * @returns {(OperatorFunction<TSource, TSource | TResult>)} Sequence resulting from applying the selector function to the
 * shared view over the source sequence.
 */
export function share(selector) {
    return function shareOperatorFunction(source) {
        return selector
            ? create(() => selector(new SharedIterable(source[Symbol.iterator]()))[Symbol.iterator]())
            : new SharedIterable(source[Symbol.iterator]());
    };
}

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