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# Incorporating Scripts (Legacy)

## Topics

### Incorporating Scripts (Legacy)

[`WebScriptObject`](/documentation/WebKit/WebScriptObject)

A `WebScriptObject` object is an Objective-C wrapper for a scripting object passed to your application from the scripting environment.

  <doc://com.apple.documentation/documentation/ObjectiveC/webscripting>

[`WebUndefined`](/documentation/WebKit/WebUndefined)

`WebUndefined` objects are simply used to represent the JavaScript “undefined” value in methods when bridging between JavaScript and Objective-C. For example, if you invoke a JavaScript function that returns the JavaScript “undefined” value, then a `WebUndefined` object is returned to the Objective-C calling context.


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