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- 'use strict';
- var $ = require('../internals/export');
- var call = require('../internals/function-call');
- var anObject = require('../internals/an-object');
- var getIteratorDirect = require('../internals/get-iterator-direct');
- var notANaN = require('../internals/not-a-nan');
- var toPositiveInteger = require('../internals/to-positive-integer');
- var createIteratorProxy = require('../internals/iterator-create-proxy');
- var IS_PURE = require('../internals/is-pure');
- var IteratorProxy = createIteratorProxy(function () {
- var iterator = this.iterator;
- var next = this.next;
- var result, done;
- while (this.remaining) {
- this.remaining--;
- result = anObject(call(next, iterator));
- done = this.done = !!result.done;
- if (done) return;
- }
- result = anObject(call(next, iterator));
- done = this.done = !!result.done;
- if (!done) return result.value;
- });
- // `Iterator.prototype.drop` method
- // https://tc39.es/ecma262/#sec-iterator.prototype.drop
- $({ target: 'Iterator', proto: true, real: true, forced: IS_PURE }, {
- drop: function drop(limit) {
- anObject(this);
- var remaining = toPositiveInteger(notANaN(+limit));
- return new IteratorProxy(getIteratorDirect(this), {
- remaining: remaining
- });
- }
- });
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