123456789101112131415161718192021222324252627282930 |
- 'use strict';
- // https://github.com/tc39/proposal-iterator-helpers
- var $ = require('../internals/export');
- var anObject = require('../internals/an-object');
- var toPositiveInteger = require('../internals/to-positive-integer');
- var createIteratorProxy = require('../internals/iterator-create-proxy');
- var IteratorProxy = createIteratorProxy(function (arg) {
- var iterator = this.iterator;
- var next = this.next;
- var result, done;
- while (this.remaining) {
- this.remaining--;
- result = anObject(next.call(iterator));
- done = this.done = !!result.done;
- if (done) return;
- }
- result = anObject(next.call(iterator, arg));
- done = this.done = !!result.done;
- if (!done) return result.value;
- });
- $({ target: 'Iterator', proto: true, real: true }, {
- drop: function drop(limit) {
- return new IteratorProxy({
- iterator: anObject(this),
- remaining: toPositiveInteger(limit)
- });
- }
- });
|