ix/asynciterable/operators/skip.mjs

The Interactive Extensions for JavaScript

import { __asyncGenerator, __await } from "tslib";
import { AsyncIterableX } from '../asynciterablex.mjs';
import { wrapWithAbort } from './withabort.mjs';
import { throwIfAborted } from '../../aborterror.mjs';
/** @ignore */
export class SkipAsyncIterable extends AsyncIterableX {
    constructor(source, count) {
        super();
        this._source = source;
        this._count = count;
    }
    [Symbol.asyncIterator](signal) {
        return __asyncGenerator(this, arguments, function* _a() {
            throwIfAborted(signal);
            const source = wrapWithAbort(this._source, signal);
            const it = source[Symbol.asyncIterator]();
            let count = this._count;
            let next;
            while (count > 0 && !(next = yield __await(it.next())).done) {
                count--;
            }
            if (count <= 0) {
                while (!(next = yield __await(it.next())).done) {
                    yield yield __await(next.value);
                }
            }
        });
    }
}
/**
 * Bypasses a specified number of elements in an async-iterable sequence and then returns the remaining elements.
 *
 * @template TSource The type of the elements in the source sequence.
 * @param {number} count The number of elements to skip before returning the remaining elements.
 * @returns {MonoTypeOperatorAsyncFunction<TSource>} An async-iterable sequence that contains the elements that
 * occur after the specified index in the input sequence.
 */
export function skip(count) {
    return function skipOperatorFunction(source) {
        return new SkipAsyncIterable(source, count);
    };
}

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