---
title: OptionalUnwrapper
framework: createmlcomponents
role: symbol
role_heading: Structure
path: createmlcomponents/optionalunwrapper
---

# OptionalUnwrapper

A transformer that unwraps optional elements and throws when encountering missing values.

## Declaration

```swift
struct OptionalUnwrapper<Element>
```

## Topics

### Creating a transformer

- [init()](createmlcomponents/optionalunwrapper/init().md)

### Performing the transformation

- [applied(to:eventHandler:)](createmlcomponents/optionalunwrapper/applied(to:eventhandler:).md)

## Relationships

### Conforms To

- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)
- [Transformer](createmlcomponents/transformer.md)

## See Also

### Preprocessors

- [LinearTransformer](createmlcomponents/lineartransformer.md)
- [ImputeTransformer](createmlcomponents/imputetransformer.md)
- [OneHotEncoder](createmlcomponents/onehotencoder.md)
- [OrdinalEncoder](createmlcomponents/ordinalencoder.md)
- [NumericImputer](createmlcomponents/numericimputer.md)
- [Reshaper](createmlcomponents/reshaper.md)
- [CategoricalImputer](createmlcomponents/categoricalimputer.md)