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comparison: addon-sdk/source/lib/sdk/util/iteration.js
addon-sdk/source/lib/sdk/util/iteration.js
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| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 'use strict'; | |
| 5 | |
| 6 module.metadata = { | |
| 7 "stability": "experimental" | |
| 8 }; | |
| 9 | |
| 10 // This is known as @@iterator in the ES6 spec. Until it is bound to | |
| 11 // some well-known name, find the @@iterator object by expecting it as | |
| 12 // the first property accessed on a for-of iterable. | |
| 13 const iteratorSymbol = (function() { | |
| 14 try { | |
| 15 for (var _ of Proxy.create({get: function(_, name) { throw name; } })) | |
| 16 break; | |
| 17 } catch (name) { | |
| 18 return name; | |
| 19 } | |
| 20 throw new TypeError; | |
| 21 })(); | |
| 22 | |
| 23 exports.iteratorSymbol = iteratorSymbol; | |
| 24 | |
| 25 // An adaptor that, given an object that is iterable with for-of, is | |
| 26 // suitable for being bound to __iterator__ in order to make the object | |
| 27 // iterable in the same way via for-in. | |
| 28 function forInIterator() { | |
| 29 for (let item of this) | |
| 30 yield item; | |
| 31 } | |
| 32 | |
| 33 exports.forInIterator = forInIterator; |
