{"json_modified": "2016-03-28T07:51:07.918732", "uuid": "4b3d8dee-cfb9-4121-bec5-53fae7156d9b", "title": "JS_GetReservedSlot", "url": "/en-US/docs/Mozilla/Projects/SpiderMonkey/JSAPI_reference/JS_GetReservedSlot", "tags": ["SpiderMonkey", "JSAPI Reference"], "translations": [], "modified": "2015-07-19T00:00:06", "label": "JS_GetReservedSlot", "localization_tags": [], "locale": "en-US", "id": 2213, "last_edit": "2015-07-18T23:59:57", "summary": "If a <a href=\"/en-US/docs/Mozilla/Projects/SpiderMonkey/JSAPI_reference/JSClass\" title=\"Use JSClass to define a custom class of JavaScript objects. A JSClass has a name, flags, and several callback functions for advanced customization of object behavior.\"><code>JSClass</code></a> has <a href=\"/en-US/docs/Mozilla/Projects/SpiderMonkey/JSAPI_reference/JSClass.flags\" title=\"The flags field is of type uint32_t. Its value is the logical OR of zero or more of the following constants:\"><code>JSCLASS_HAS_RESERVED_SLOTS(n)</code></a> in its <code>flags</code>, with <var>n</var> &gt; 0, or has a non-null <a href=\"/en-US/docs/Mozilla/Projects/SpiderMonkey/JSAPI_reference/JSClass.reserveSlots\" title=\"JSClass offers following hook:\"><code>JSClass.reserveSlots</code></a> callback, then objects of that class have <code>n</code> <dfn>reserved slots</dfn> in which the application may store data. These fields are not directly exposed to scripts.", "sections": [{"id": "Quick_Links", "title": null}, {"id": "Syntax", "title": "Syntax"}, {"id": "Description", "title": "Description"}, {"id": "See_Also", "title": "See Also"}], "slug": "Mozilla/Projects/SpiderMonkey/JSAPI_reference/JS_GetReservedSlot", "review_tags": []}