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- 'use strict';
- // https://github.com/tc39/proposal-iterator-helpers
- var $ = require('../internals/export');
- var apply = require('../internals/function-apply');
- var anObject = require('../internals/an-object');
- var toPositiveInteger = require('../internals/to-positive-integer');
- var createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy');
- var AsyncIteratorProxy = createAsyncIteratorProxy(function (Promise, args) {
- var state = this;
- return new Promise(function (resolve, reject) {
- var loop = function () {
- try {
- Promise.resolve(
- anObject(apply(state.next, state.iterator, state.remaining ? [] : args))
- ).then(function (step) {
- try {
- if (anObject(step).done) {
- state.done = true;
- resolve({ done: true, value: undefined });
- } else if (state.remaining) {
- state.remaining--;
- loop();
- } else resolve({ done: false, value: step.value });
- } catch (err) { reject(err); }
- }, reject);
- } catch (error) { reject(error); }
- };
- loop();
- });
- });
- $({ target: 'AsyncIterator', proto: true, real: true, forced: true }, {
- drop: function drop(limit) {
- return new AsyncIteratorProxy({
- iterator: anObject(this),
- remaining: toPositiveInteger(limit)
- });
- }
- });
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