Question

How to remove file extension in Swift

Answer 1

import Foundation

/// Removes the last file extension from a filename or path.
///
/// Examples:
/// - "document.pdf"      -> "document"
/// - "archive.tar.gz"    -> "archive.tar"
/// - "photo.jpg"         -> "photo"
/// - "README"            -> "README"
/// - "/tmp/file.txt"     -> "/tmp/file"
/// - ".gitignore"        -> ".gitignore"
///
/// - Parameter path: A filename or full path.
/// - Returns: The filename/path without its last extension.
/// - Throws: `FilePathError.emptyPath` if the path is empty.
func removeFileExtension(from path: String) throws -> String {
    guard !path.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty else {
        throw FilePathError.emptyPath
    }

    let url = URL(fileURLWithPath: path)

    // Remove only the last extension.
    let pathWithoutExtension = url.deletingPathExtension().path

    return pathWithoutExtension
}

/// Errors related to file path validation.
enum FilePathError: Error {
    case emptyPath
}

// Example usage
do {
    print(try removeFileExtension(from: "document.pdf"))
    print(try removeFileExtension(from: "archive.tar.gz"))
    print(try removeFileExtension(from: ".gitignore"))
    print(try removeFileExtension(from: "/tmp/file.txt"))
    print(try removeFileExtension(from: "C:\\Temp\\a.txt"))
    print(try removeFileExtension(from: "README"))
} catch {
    print("Error: \(error)")
}



/*
run:

document
archive.tar
.gitignore
/tmp/file

README

*/

 

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Answer 2

import Foundation

/// Removes the last file extension from a filename or path.
func removeFileExtension(from path: String) -> String {
    URL(fileURLWithPath: path)
        .deletingPathExtension()
        .path
}

// Example usage
do {
    print(try removeFileExtension(from: "document.pdf"))
    print(try removeFileExtension(from: "archive.tar.gz"))
    print(try removeFileExtension(from: ".gitignore"))
    print(try removeFileExtension(from: "/tmp/file.txt"))
    print(try removeFileExtension(from: "C:\\Temp\\a.txt"))
    print(try removeFileExtension(from: "README"))
} catch {
    print("Error: \(error)")
}



/*
run:

document
archive.tar
.gitignore
/tmp/file

README

*/

 

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Answer 3

import Foundation

/// Removes the last extension from a filename or path.
func removeFileExtension(from path: String) -> String {
    guard let dotIndex = path.lastIndex(of: ".") else {
        return path
    }

    return String(path[..<dotIndex])
}

// Example usage
do {
    print(try removeFileExtension(from: "document.pdf"))
    print(try removeFileExtension(from: "archive.tar.gz"))
    print(try removeFileExtension(from: ".gitignore"))
    print(try removeFileExtension(from: "/tmp/file.txt"))
    print(try removeFileExtension(from: "C:\\Temp\\a.txt"))
    print(try removeFileExtension(from: "README"))
} catch {
    print("Error: \(error)")
}



/*
run:

document
archive.tar

/tmp/file
C:\Temp\a
README

*/

 

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