---
title: Void
framework: swift
role: symbol
role_heading: Type Alias
path: swift/void
---

# Void

The return type of functions that don’t explicitly specify a return type, that is, an empty tuple ().

## Declaration

```swift
typealias Void = ()
```

## Discussion

Discussion When declaring a function or method, you don’t need to specify a return type if no value will be returned. However, the type of a function, method, or closure always includes a return type, which is Void if otherwise unspecified. Use Void or an empty tuple as the return type when declaring a closure, function, or method that doesn’t return a value. // No return type declared: func logMessage(_ s: String) {     print("Message: \(s)") }

let logger: (String) -> Void = logMessage logger("This is a void function") // Prints "Message: This is a void function"