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    This article is in need of a technical review.

    This article covers features introduced in SpiderMonkey 1.8.5

    Query [[Extensible]] properly of the given object.


    JS_IsExtensible(JSContext *cx, JS::HandleObject obj, bool *extensible);
    Name Type Description
    cx JSContext * The context. Requires request. In a JS_THREADSAFE build, the caller must be in a request on this JSContext.
    obj JS::HandleObject The object to examine.
    extensible bool * Out parameter. Receives true if extensible, false otherwise.


    JS_IsExtensible queries [[Extensible]] property of the specified object, obj.

    If successful, JS_IsExtensible stores [[Extensible]] property to *extensible and returns true, otherwise returns false and the value of *extensible is undefined.

    See also

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    Contributors to this page: fscholz, ethertank, trevorh, arai, kscarfone, markg
    Last updated by: arai,
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