What’s new in Swift

import AWSLambdaRuntime

Lambda.run { (_, event: String, callback) in
    callback(.success("Hello, \(event)"))
}

// Type-based program entry points

import ArgumentParser

@main
struct Hello: ParsableCommand {
    @Argument(help: "The name to greet.")
    var name: String

    func run() {
        print("Hello, \(name)!")
    }
}

// Synthesized comparable conformance for enums

enum MessageStatus: Hashable, Comparable {
    case draft
    case saved
    case failedToSend
    case sent
    case delivered
    case read

    var wasSent: Bool {
        self >= .sent
    }
}

// Apple Archive

import AppleArchive

try ArchiveByteStream.withFileStream(
    path: "/tmp/VacationPhotos.aar",
    mode: .writeOnly,
    options: [.create, .truncate],
    permissions: [.ownerReadWrite, .groupRead, .otherRead]
) { file in
    // Receives raw bytes and writes compressed bytes to `file`
    try ArchiveByteStream.withCompressionStream(using: .lzfse, writingTo: file) { compressor in
        // Receives archive entries, and writes bytes to `compressor`
        try ArchiveStream.withEncodeStream(writingTo: compressor) { encoder in
            // Writes all entries from `src` to `encoder`
            try encoder.writeDirectoryContents(archiveFrom: source, keySet: fieldKeySet)
        }
    }
}

logger.log("\(offerID, align: .left(columns: 10), privacy: .public)")
// Logs "E1Z3F    "

logger.log("\(seconds, format: .fixed(precision: 2)) seconds")
// Logs "1.30 seconds"

// Swift ArgumentParser

import ArgumentParser

@main
struct Hello: ParsableCommand {
    @Option(name: .shortAndLong, help: "The number of times to say hello.")
    var count: Int = 1

    @Argument(help: "The name to greet.")
    var name: String

    func run() {
        for _ in 1...count {
            print("Hello, \(name)!")
        }
    }
}