{"json_modified": "2016-03-28T08:16:05.067115", "uuid": "1e1434e6-dc21-4fd5-8410-33ecc94aebec", "title": "JSEnumerateOp", "url": "/en-US/docs/Mozilla/Projects/SpiderMonkey/JSAPI_reference/JSEnumerateOp", "tags": ["SpiderMonkey", "JSAPI Reference"], "translations": [], "modified": "2015-01-03T07:59:47", "label": "JSEnumerateOp", "localization_tags": [], "locale": "en-US", "id": 18038, "last_edit": "2015-01-03T07:59:40", "summary": "<strong><code>JSEnumerateOp</code></strong> is called just before an object is enumerated (via a <code>for...in</code> statement, an array comprehension, or a call to <a href=\"/en-US/docs/Mozilla/Projects/SpiderMonkey/JSAPI_reference/JS_Enumerate\" title=\"JS_Enumerate gets the ids of all own properties of the specified object, obj, that have the JSPROP_ENUMERATE attribute. (The term own property refers to a property that is not inherited from the object's prototype.) This is not quite the same behavior as a JavaScript for...in loop, which converts all property ids to strings and also enumerates inherited properties.\"><code>JS_Enumerate</code></a>). It should define any remaining lazy properties that should be enumerable but are not yet defined in <code>obj</code>. This hook does not implement iteration: once the properties are defined, the JavaScript engine can enumerate them.", "sections": [{"id": "Quick_Links", "title": null}, {"id": "Syntax", "title": "Syntax"}, {"id": "Description", "title": "Description"}, {"id": "JSClass_hooks", "title": null}, {"id": "See_Also", "title": "See Also"}], "slug": "Mozilla/Projects/SpiderMonkey/JSAPI_reference/JSEnumerateOp", "review_tags": []}