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 how modern iPhone, iPad, Mac, and Apple Watch apps get built — Apple introduced it in 2014 as a safe, fast successor to Objective-C, and companies like Uber, Lyft, and Airbnb write their iOS apps in it. Less well known: Swift is fully open source and runs on Linux, which is exactly how it executes here — a Swift toolchain compiles your file and runs it in an interactive terminal where readLine() waits for typed input. With Swift 6 adding compile-time data-race safety to its concurrency story, this page is a convenient way to practice optionals, closures, and protocols without owning a Mac.
print("Enter your name: ", terminator: "")
let name = readLine() ?? "friend"
print("Enter scores separated by spaces: ", terminator: "")
let scores = (readLine() ?? "")
.split(separator: " ")
.compactMap { Int($0) }
let total = scores.reduce(0, +)
print("Nice to meet you, \(name)!")
print("You entered \(scores.count) scores totaling \(total).")
if let best = scores.max() {
print("Best score: \(best)")
} else {
print("No valid scores found.")
}Learn Swift before you can afford the Mac — students on Windows or Chromebook laptops can complete the language portion of an iOS course entirely in this sandbox, then transfer to Xcode later. iOS interview prep leans heavily on language questions (optionals and unwrapping, value versus reference semantics, closures capturing self), all of which are testable here as plain console programs. It's also handy for isolating an algorithm from a SwiftUI app to debug it without simulator rebuilds.
Yes — your program runs attached to a live terminal, so each readLine() call suspends execution until you type a line. Note that readLine() returns an optional String?, which makes it a nice built-in exercise in optional handling: our example uses the ?? operator to supply a default.
No — UIKit and SwiftUI require Apple platforms and a rendering environment, and this sandbox runs Swift on Linux as a console program. Everything at the language level works: structs, enums with associated values, protocols and extensions, generics, closures, and error handling — which is precisely the layer most courses and interviews test.
Swift on Linux ships with the open-source Foundation implementation alongside the standard library, so types commonly seen in tutorials — String APIs, Date, and formatting helpers — are generally usable. A few Foundation corners behave differently on Linux than on macOS, so platform-specific behavior is worth verifying locally before shipping.
main.swiftswiftreadLine()print("Hello from Swift!")
print("Welcome to XCODX Online Compiler!")
let message = "Swift is awesome!"
print(message)