# init(version:attributes:className:parentClass:staticValues:staticFunctions:initialize:finalize:hasProperty:getProperty:setProperty:deleteProperty:getPropertyNames:callAsFunction:callAsConstructor:hasInstance:convertToType:) Creates a class definition with the specified values. ``` init(version: Int32, attributes: JSClassAttributes, className: UnsafePointer!, parentClass: JSClassRef!, staticValues: UnsafePointer!, staticFunctions: UnsafePointer!, initialize: JSObjectInitializeCallback!, finalize: JSObjectFinalizeCallback!, hasProperty: JSObjectHasPropertyCallback!, getProperty: JSObjectGetPropertyCallback!, setProperty: JSObjectSetPropertyCallback!, deleteProperty: JSObjectDeletePropertyCallback!, getPropertyNames: JSObjectGetPropertyNamesCallback!, callAsFunction: JSObjectCallAsFunctionCallback!, callAsConstructor: JSObjectCallAsConstructorCallback!, hasInstance: JSObjectHasInstanceCallback!, convertToType: JSObjectConvertToTypeCallback!) ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)