---
title: JSObjectInitializeCallback
framework: javascriptcore
role: symbol
role_heading: Type Alias
path: javascriptcore/jsobjectinitializecallback
---

# JSObjectInitializeCallback

The callback type for first creating an object.

## Declaration

```swift
typealias JSObjectInitializeCallback = (JSContextRef?, JSObjectRef?) -> Void
```

## Parameters

- `ctx`: The execution context to use.
- `object`: The doc://com.apple.javascriptcore/documentation/JavaScriptCore/JSObjectRef to create.

## Discussion

Discussion If you name your function Initialize, you declare it like this: void Initialize(JSContextRef ctx, JSObjectRef object); Unlike the other object callbacks, the system calls the initialize callback on the least-derived class (the parent class) first, and the most-derived class last.

## See Also

### Managing Callbacks

- [initialize](javascriptcore/jsclassdefinition/initialize.md)
- [finalize](javascriptcore/jsclassdefinition/finalize.md)
- [JSObjectFinalizeCallback](javascriptcore/jsobjectfinalizecallback.md)
- [hasProperty](javascriptcore/jsclassdefinition/hasproperty.md)
- [JSObjectHasPropertyCallback](javascriptcore/jsobjecthaspropertycallback.md)
- [getProperty](javascriptcore/jsclassdefinition/getproperty.md)
- [JSObjectGetPropertyCallback](javascriptcore/jsobjectgetpropertycallback.md)
- [setProperty](javascriptcore/jsclassdefinition/setproperty.md)
- [JSObjectSetPropertyCallback](javascriptcore/jsobjectsetpropertycallback.md)
- [deleteProperty](javascriptcore/jsclassdefinition/deleteproperty.md)
- [JSObjectDeletePropertyCallback](javascriptcore/jsobjectdeletepropertycallback.md)
- [getPropertyNames](javascriptcore/jsclassdefinition/getpropertynames.md)
- [JSObjectGetPropertyNamesCallback](javascriptcore/jsobjectgetpropertynamescallback.md)
- [callAsFunction](javascriptcore/jsclassdefinition/callasfunction.md)
- [JSObjectCallAsFunctionCallback](javascriptcore/jsobjectcallasfunctioncallback.md)