Function ul_sys::JSObjectHasProperty

pub unsafe extern "C" fn JSObjectHasProperty(
    ctx: JSContextRef, 
    object: JSObjectRef, 
    propertyName: JSStringRef
) -> bool

@function @abstract Tests whether an object has a given property. @param object The JSObject to test. @param propertyName A JSString containing the property’s name. @result true if the object has a property whose name matches propertyName, otherwise false.