<!--
{
  "availability" : [
    "iOS: 16.0.0 -",
    "iPadOS: 16.0.0 -",
    "macCatalyst: 16.0.0 -",
    "macOS: 13.0.0 -",
    "tvOS: 16.0.0 -",
    "visionOS: 1.0.0 -",
    "watchOS: 11.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "CreateMLComponents",
  "identifier" : "/documentation/CreateMLComponents/OptionalUnwrapper/applied(to:eventHandler:)",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "Create ML Components"
    ],
    "preciseIdentifier" : "s:18CreateMLComponents17OptionalUnwrapperV7applied2to12eventHandlerxxSg_yAA5EventVYbcSgtKF"
  },
  "title" : "applied(to:eventHandler:)"
}
-->

# applied(to:eventHandler:)

Unwraps an optional element or throws if the value is `nil`.

```
func applied(to input: Element?, eventHandler: EventHandler? = nil) throws -> Element
```

## Parameters

`input`

The optional input.

`eventHandler`

An event handler.

## Return Value

The unwrapped value.

## Discussion> Throws: `MissingValueError` if the input is `nil`.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)