# init(_:) Creates a new instance from the given integer. ``` init(_ source: T) where T : BinaryInteger ``` ## Parameters `source` An integer to convert. `source` must be representable in this type. ## Discussion If the value passed as `source` is not representable in this type, a runtime error may occur. ``` let x = -500 as Int let y = Int32(x) // y == -500 // -500 is not representable as a 'UInt32' instance let z = UInt32(x) // Error ``` --- Copyright © 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)