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# type(forKey:)

Returns the name of the declared type of the attribute or relationship identified by the passed key.

```
func type(forKey key: String) -> String?
```

## Parameters

`key`

The identifying key for an attribute, one-to-one relationship, or one-to-many relationship of the receiver.

## Return Value

The name of the declared type of the attribute or relationship identified by `key`; for example, “NSString”. Searches in the receiver first, then in any superclass. Returns `nil` if no match is found.

## See Also

[`isReadOnlyKey:`](/documentation/Foundation/NSScriptClassDescription/isReadOnlyKey:)

Returns a Boolean value indicating whether a specified property in the receiver is read-only.


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