Deprecated since JavaScript 1.8.5
This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

Warning! JSObjectOps is not a supported API. Details of the API may change from one release to the next. This documentation should be considered SpiderMonkey internals documentation, not API documentation. See bug 408416 for details.

The JSObjectOps.enumerate callback implements iteration over object properties. The type of the callback is JSNewEnumerateOp.

For native objects, the enumerate callback first checks the JSCLASS_NEW_ENUMERATE flag of the object's class. If the flag is present, enumerate simply delegates the call to JSClass.enumerate.

Otherwise, it invokes the JSClass.enumerate hook as an old-style JSEnumerateOp to give the object an opportunity to define any remaining lazy properties. Then it iterates over obj's defined properties, walking the internal data structure they're stored in.