# enumerateLines(_:) Enumerates all the lines in the string. ``` func enumerateLines(_ block: @escaping (String, UnsafeMutablePointer) -> Void) ``` ## Parameters `block` The block executed for the enumeration. The block takes two arguments: - line: The current line of the string being enumerated. The line contains just the contents of the line, without the line terminators. See [`getLineStart(_:end:contentsEnd:for:)`](/documentation/Foundation/NSString/getLineStart(_:end:contentsEnd:for:)) for a discussion of line terminators. - stop: A reference to a Boolean value that the block can use to stop the enumeration by setting `*stop = YES`; it should not touch `*stop` otherwise. ## Discussion --- 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)