Welcome to XCODX Online Compiler
Quick Start:
Ctrl+Enter Run code
Ctrl+S Save / Download
Ctrl+L Clear output
Select a language and start coding.
Swift is a general-purpose programming language that Apple introduced in 2014 and open-sourced in 2015, designed by a team led by Chris Lattner to succeed Objective-C. It is the primary language for building iPhone, iPad, Mac, Apple Watch, and Apple TV apps, but since going open source it also runs on Linux and Windows and powers server-side frameworks such as Vapor and Hummingbird. Swift leans on strong static typing, value types, and optionals -- a type-level distinction between 'a value' and 'no value' that pushes null-related crashes into the compiler instead of runtime. It reads almost like a scripting language yet compiles to fast native code through LLVM. On XCODX the open-source Swift toolchain runs your code in the browser, so you can practice the syntax without Xcode or a Mac.
struct Language {
let name: String
let year: Int
}
let langs = [
Language(name: "Swift", year: 2014),
Language(name: "Rust", year: 2015),
Language(name: "Go", year: 2009),
]
// Closures: sort by release year, then print each entry
for lang in langs.sorted(by: { $0.year < $1.year }) {
print("\(lang.name) -> \(lang.year)")
}
// Optionals: look up a language without crashing on a miss
func find(_ name: String) -> Language? {
return langs.first { $0.name == name }
}
if let hit = find("Rust") {
print("Found \(hit.name), released \(hit.year)")
} else {
print("Not found")
}
let newest = langs.max(by: { $0.year < $1.year })!
print("Newest language here: \(newest.name)")Swift's core strength is building apps across Apple's platforms -- iOS, macOS, watchOS, and tvOS -- where it is the default language with first-class SwiftUI tooling. Its optionals, value semantics, and modern concurrency model of async/await and actors make it a strong choice for large, safety-conscious codebases, and server frameworks like Vapor now run it in production on Linux. Reach for Swift when you are targeting Apple devices, or when you want app-level ergonomics with native performance. It is a weaker fit for cross-platform desktop GUI work outside Apple's ecosystem, where the tooling and library support are thinner than for the mobile case it was built around.
Use readLine(), which reads one line from standard input and returns an optional String (nil at end of input). Convert it as needed, for example let n = Int(readLine()!) ?? 0. On XCODX the terminal is live, so readLine() pauses and waits while you type -- press Enter for each line and Ctrl+D to close the stream -- or you can fill the Stdin Box before running.
No. The sandbox runs the Swift toolchain on a single file with no Package.swift and no network, so Swift Package Manager cannot fetch anything -- Vapor, Alamofire, and every other third-party package are unavailable. What you do get is the standard library plus the basics of Foundation, which you can reach with import Foundation. Full package projects need a local Swift install or Xcode.
An optional, written String?, is a type that holds either a value or nil, so the compiler forces you to handle the 'no value' case instead of crashing later. Unwrap it safely with if let or guard let binding, or supply a fallback using the nil-coalescing operator ??. Force-unwrapping with ! works only when you are certain a value exists -- if it is nil, the program traps and stops.
Not here. XCODX runs the open-source Swift toolchain on Linux, so plain Swift code -- types, closures, generics, protocols, and concurrency -- executes in the browser with no Mac, no Xcode, and no signup. What you cannot do is anything that requires Apple frameworks such as UIKit or SwiftUI, which are not part of the open-source Linux toolchain.
No. This sandbox executes command-line Swift and prints to a terminal; it has no simulator, no UIKit or SwiftUI, and no way to produce an app bundle. It is meant for learning language features and working through algorithms. Real iOS development still needs Xcode on a Mac.
Yes. The modern concurrency model -- async/await, Task, and actors, introduced around Swift 5.5 and hardened in Swift 6 -- is part of the language and runs in the sandbox; the exact toolchain version appears in the badge. Keep the short run timeout in mind, and note there is no network access, so tasks that wait on remote I/O will not complete.
main.swiftswiftreadLine()print("Hello from Swift!")
print("Welcome to XCODX Online Compiler!")
let message = "Swift is awesome!"
print(message)