| '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/create-iterator-proxy'); |
| |
| var IteratorProxy = createIteratorProxy(function (arg) { |
| if (!this.remaining--) { |
| this.done = true; |
| return; |
| } |
| var result = anObject(this.next.call(this.iterator, arg)); |
| var done = this.done = !!result.done; |
| if (!done) return result.value; |
| }); |
| |
| $({ target: 'Iterator', proto: true, real: true }, { |
| take: function take(limit) { |
| return new IteratorProxy({ |
| iterator: anObject(this), |
| remaining: toPositiveInteger(limit) |
| }); |
| } |
| }); |