# init(stringInterpolation:) Creates a new instance from an interpolated string literal. ``` init(stringInterpolation: DefaultStringInterpolation) ``` ## Discussion Don’t call this initializer directly. It’s used by the compiler when you create a string using string interpolation. Instead, use string interpolation to create a new string by including values, literals, variables, or expressions enclosed in parentheses, prefixed by a backslash (`\(`…`)`). ``` let price = 2 let number = 3 let message = """ If one cookie costs \(price) dollars, \ \(number) cookies cost \(price * number) dollars. """ // message == "If one cookie costs 2 dollars, 3 cookies cost 6 dollars." ``` --- 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)