---
title: BooleanLiteralType
framework: swift
role: symbol
role_heading: Type Alias
path: swift/booleanliteraltype
---

# BooleanLiteralType

The default type for an otherwise-unconstrained Boolean literal.

## Declaration

```swift
typealias BooleanLiteralType = Bool
```

## Discussion

Discussion When you create a constant or variable using one of the Boolean literals true or false, the resulting type is determined by the BooleanLiteralType alias. For example: let isBool = true print("isBool is a '\(type(of: isBool))'") // Prints "isBool is a 'Bool'" The type aliased by BooleanLiteralType must conform to the ExpressibleByBooleanLiteral protocol.

## See Also

### Basic Values

- [IntegerLiteralType](swift/integerliteraltype.md)
- [FloatLiteralType](swift/floatliteraltype.md)