---
title: "JSObjectMakeFunctionWithCallback(_:_:_:)"
framework: javascriptcore
role: symbol
role_heading: Function
path: "javascriptcore/jsobjectmakefunctionwithcallback(_:_:_:)"
---

# JSObjectMakeFunctionWithCallback(_:_:_:)

Creates a JavaScript function with a specified callback as its implementation.

## Declaration

```swift
func JSObjectMakeFunctionWithCallback(_ ctx: JSContextRef!, _ name: JSStringRef!, _ callAsFunction: JSObjectCallAsFunctionCallback!) -> JSObjectRef!
```

## Parameters

- `ctx`: The execution context to use.
- `name`: A doc://com.apple.javascriptcore/documentation/JavaScriptCore/JSStringRef that contains the function’s name. The system uses this when converting the function to a string. Pass NULL to create an anonymous function.
- `callAsFunction`: The doc://com.apple.javascriptcore/documentation/JavaScriptCore/JSObjectCallAsFunctionCallback to invoke when calling the function.

## Return Value

Return Value A JSObjectRef that is a function. The object’s prototype is the default function prototype.

## See Also

### Working with Objects

- [JSObjectCallAsConstructor(_:_:_:_:_:)](javascriptcore/jsobjectcallasconstructor(_:_:_:_:_:).md)
- [JSObjectCallAsFunction(_:_:_:_:_:_:)](javascriptcore/jsobjectcallasfunction(_:_:_:_:_:_:).md)
- [JSObjectCopyPropertyNames(_:_:)](javascriptcore/jsobjectcopypropertynames(_:_:).md)
- [JSObjectDeleteProperty(_:_:_:_:)](javascriptcore/jsobjectdeleteproperty(_:_:_:_:).md)
- [JSObjectGetPrivate(_:)](javascriptcore/jsobjectgetprivate(_:).md)
- [JSObjectGetProperty(_:_:_:_:)](javascriptcore/jsobjectgetproperty(_:_:_:_:).md)
- [JSObjectGetPropertyAtIndex(_:_:_:_:)](javascriptcore/jsobjectgetpropertyatindex(_:_:_:_:).md)
- [JSObjectGetPrototype(_:_:)](javascriptcore/jsobjectgetprototype(_:_:).md)
- [JSObjectHasProperty(_:_:_:)](javascriptcore/jsobjecthasproperty(_:_:_:).md)
- [JSObjectIsConstructor(_:_:)](javascriptcore/jsobjectisconstructor(_:_:).md)
- [JSObjectIsFunction(_:_:)](javascriptcore/jsobjectisfunction(_:_:).md)
- [JSObjectMake(_:_:_:)](javascriptcore/jsobjectmake(_:_:_:).md)
- [JSObjectMakeArray(_:_:_:_:)](javascriptcore/jsobjectmakearray(_:_:_:_:).md)
- [JSObjectMakeConstructor(_:_:_:)](javascriptcore/jsobjectmakeconstructor(_:_:_:).md)
- [JSObjectMakeDate(_:_:_:_:)](javascriptcore/jsobjectmakedate(_:_:_:_:).md)