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# implementationClassName

Returns the name of the Objective-C class instantiated to implement the scripting class.

```
var implementationClassName: String? { get }
```

## Return Value

An Objective-C class name.

## Discussion

The name returned by the [`className`](/documentation/Foundation/NSScriptClassDescription/className) method for an instance of `NSScriptClassDescription` resulting from an sdef class declaration is the human-readable name for the class—that is, the name that is used in a script. To obtain the name of the Objective-C class instantiated to implement the class, use `implementationClassName`.

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