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Here, you’ll find information about the how to use the Swift programming language.

If you’re new to Swift, check out A Swift Tour inThe Swift Programming Language, for a quick introduction to themost important concepts and features of the language.

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Installing Swift

The first step to using Swift is to download and installthe compiler and other required components.Go to the Download pageand follow the instructions for your target platform.

In order to follow along with the examples below,make sure to add Swift to your $PATH.

On macOS

The default location for the downloadable toolchain on macOS is/Library/Developer/Toolchains.You can make the latest installed toolchain available for use from the terminal with the following command:

To select any other installed toolchain, use its identifier in the TOOLCHAINSvariable. The identifier can be found in toolchain’s Info.plist file.

On Linux

1. Install required dependencies:

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If you installed the Swift toolchain on Linuxto a directory other than the system root,you will need to run the following command,using the actual path of your Swift installation:

On Windows

Visual Studio and Swift

You will need to install both the toolchain installer from theDownload page and Visual Studio 2019.

The following Visual Studio components are required:

¹ You may install a newer build toolset.
² You may install a newer SDK instead.

The following additional Visual Studio components are recommended:

The default installation location for the toolchain on Windows is%SystemDrive%LibraryDeveloperToolchains.

Support Files

Note that you must use the x64 Native Tools for VS2019 Command Prompt to runthe toolchain. The x64 Native Tools for VS2019 Command Prompt runs theDevEnv script from Visual Studio that sets up the necessary environmentvariables to find the system headers.

In order to make the Windows SDK accessible to Swift, it is necessary to deploya few files into the Windows SDK. The following will modify your Visual StudioInstallation, and as such will require to be run from an (elevated)“Administrator” x86 Native Tools for VS2019 Command Prompt.

Because it is installing the files into the Visual Studio image, the files willneed to be copied each time Visual Studio is updated.

Swift Version

You can verify that you are running the expected version of Swiftby entering the swift command and passing the --version flag:

The -dev suffix on the version numberis used to indicate that it’s a development build,not a released version.

Using the REPL

If you run the swift command without any other arguments,you’ll launch the REPL, an interactive shellthat will read, evaluate, and print the resultsof any Swift code you enter.

Interacting with the REPL is a great way to experiment with Swift.For example, if you enter the expression 1 + 2,the result of the expression, 3, is printed on the next line:

You can assign values to constants and variables,and use them in subsequent lines.For instance, the String value Hello, world!can be assigned to the constant greeting,and then passed as an argument to the print(_:) function:

If you enter an invalid expression,the REPL will print an error showing where the problem occurred:

You can use the up-arrow and down-arrow keys (↑ and ↓)to cycle through previous lines entered into the REPL.This allows you to make a slight change to a previous expressionwithout retyping the entire line,and is especially convenient for fixing errors like the one in the previous example:

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Another useful feature of the REPLis that it can automatically suggest functions and methodsthat can be used in a particular context.For example, if you enter reafter a dot operator on a String valueand then hit the tab key (⇥),the REPL will give a list of available completionslike remove(at:) and replaceSubrange(bounds:with:):

If you start a block of code,such as when iterating over an array with a for-in loop,the REPL will automatically indent the next line,and change the prompt character from > to .to indicate that code entered on that linewill only be evaluated when the entire code block is evaluated.

All of the functionality of Swift is available to you from the REPL,from writing control flow statementsto declaring and instantiating structures and classes.

You can also import any available system modules,such as Darwin on macOS and Glibc on Linux:

On macOS

On Linux

On Windows

The REPL depends on Python bindings. You must ensure that Python is availablein the path. The following command adds Python to the PATH so that it can beused:

Because the Windows installation separates out the SDK from the toolchain, a fewextra parameters must be passed to the REPL. This allows you to use multipledifferent SDKs with the same toolchain.

Using the Package Manager

Swift package manager provides a convention-based system forbuilding libraries and executables, and sharing code across different packages.

These examples assume you have made swift available in your path;see Installing for more information.Once available, you can invoke the package manager tools: swift package, swift run, swift build and swift test.

Creating a Package

To create a new Swift package, first create and enter a directory named Hello:

Every package must have a manifest file called Package.swift in its root directory.You can create a minimal package named Hello using:

By default the init command will create a library package directory structure:

You can use swift build to build a package. This will download, resolve and compile dependencies mentionedin the manifest file Package.swift.

To run the tests for a package, use: swift test

Building an Executable

A target is considered as an executable if it contains a file named main.swift.The package manager will compile that file into a binary executable.

In this example,the package will produce an executable named Hellothat outputs “Hello, world!”.

First create and enter a directory called Hello:

Now run the swift package’s init command with executable type:

Use the swift run command to build and run the executable:

Note: Since there is only one executable in this package, we can omit theexecutable name from the swift run command.

You can also compile the package by running the swift build command and then runthe binary from .build directory:

As a next step, let’s define a new sayHello(name:) functionin a new source file, and have the executable call thatinstead of calling print(_:) directly.

Working with Multiple Source Files

Create a new file in the Sources/Hello directory called Greeter.swift,and enter the following code:

The sayHello(name:) function takes a single String argumentand prints our “Hello” greeting before, substituting the word “World”with the function argument.

Now, open main.swift again, and replace the existing contents with the following code:

Rather than using a hardcoded name as before,main.swift now reads from the command line arguments.And instead of invoking print(_:) directly,main.swift now calls the sayHello(name:) method.Because the method is part of the Hello module,no import statement is necessary.

Run swift run and try out the new version of Hello:

To learn about the Swift Package Manager,including how to build modules, import dependencies, and map system libraries,see the Swift Package Manager section of the website.

Using the LLDB Debugger

You can use the LLDB debugger torun Swift programs step-by-step,set breakpoints,and inspect and modify program state.

As an example,consider the following Swift code,which defines a factorial(n:) function,and prints the result of calling that function:

Create a file named Factorial.swift with the code above,and run the swiftc command,passing the filename as a command line argument,along with the -g option to generate debug information.This will create an executable named Factorialin the current directory.

Instead of running the Factorial program directly,run it through the LLDB debuggerby passing it as a command line argument to the lldb command.

This will start an interactive consolethat allows you to run LLDB commands.

For more information about LLDB commands,see the LLDB Tutorial.

Set a breakpoint on line 2 of the factorial(n:) functionwith the breakpoint set (b) command,to have the process break each time the function is executed.

Run the process with the run (r) command.The process will stop at the call site of the factorial(n:) function.

Use the print (p) commandto inspect the value of the n parameter.

The print command can evaluate Swift expressions as well.

Use the backtrace (bt) commandto show the frames leading to factorial(n:) being called.

Use the continue (c) commandto resume the process until the breakpoint is hit again.

Use the print (p) command againto inspect the value of the n parameterfor the second call to factorial(n:).

Use the breakpoint disable (br di) commandto disable all breakpointsand the continue (c) commandto have the process run until it exits.

Now that you’ve been introduced to the Swift REPL, build system, and debugger,here are a few suggestions for what to do next:

• Check out the Package Manager project pagefor a deep dive into the Swift build system and package manager.
• Read Contributing to Swiftto learn about the different ways you can participate in the Swift community.
• Go to developer.apple.com/swiftfor additional Swift resources, including videos, sample code, and playgrounds.

The Swift project is introducing new downloadable Swift toolchain images for Windows! These images contain development components needed to build and run Swift code on Windows.

For over a year now, there has been a significant endeavour to port Swift to Windows in conjunction with the developer community at swift.org. The Windows support is now at a point where early adopters can start using Swift to build real experiences on this platform.

Bringing Swift to Windows

Porting Swift to Windows is not about simply porting the compiler, but rather ensuring that the full ecosystem is available on the platform. This includes the compiler, the standard library, and the core libraries (dispatch, Foundation, XCTest). These libraries are part of what enables developers to write powerful applications with ease and without having to worry about many of the details of the underlying system. There are many technical details in the story of bringing Swift to a usable state on Windows, and if you are interested in them, I would recommend checking out my talk on the topic from the LLVM Developer Conference.

With these core libraries and the flexible interoperability of Swift with C, it is possible to develop applications on Windows purely in Swift while taking advantage of the existing corpus of libraries on the Windows platforms.

Example Application

This demo calculator is written entirely in Swift, with code seamlessly flipping between the application code written in Swift and the system libraries:

This project was built using:

1. The Swift toolchain on Windows

2. An installation of Visual Studio 2019 which delivers the other needed pieces in the form of CMake, Ninja, and the Windows SDK

Although the demo application is built with CMake, Swift Package Manager support on Windows is coming along. It will soon be possible to get the application building using swift build without needing CMake or Ninja.

Here you can see stepping through the application using lldb:

Cross-Platform Applications

Early adopters like Readdle are experimenting with cross-platform applications written in Swift, easily bringing many of the existing Swift libraries to Windows to support their applications.

I had been working with Alexander at Readdle about his team’s work, and he sent me this note:

We at Readdle started experimenting with Swift on Windows more than a year ago, in Q2 of 2019. By that time we already released Spark for Android which uses Swift to share core code with iOS/macOS, and the opportunity to extend to one more platform was really tempting.

Despite some functionality being unready as of yet, Swift on Windows turned out to be fully satisfying our needs. In fact, some third party C/C++ dependencies gave us more headaches than Swift did itself. All business logic of Spark is located in a separate Core module. A pack of modules, actually, but we refer to them as Core. This allows us to use any UI framework on the target platform: AppKit on macOS, UIKit on iOS, native UI Toolkit on Android. So, basically, we had to port Spark Core on Windows. After all initial concepts were proved, it was mostly routine day-to-day work to bring it alive on Windows.

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What we have now:

• 9 Swift modules (255 739 SLOC, 2 133 source files)
• 3 third party swift modules
• 1452 tests (powered by XCTest)
• Windows-based CI to keep all tests green
• Heterogenous build system (partially CMake, partially custom scripts)

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As a good example, pure Swift modules like CryptoSwift and OAuthSwift almost worked right out of the box. We did trivial imports adjustment, excluded a few AppKit/UIKit references and voilà!

Another challenge was to decide how to implement the user interface. After extensive discourse we ended up with Electron as the front-end part of future Spark for Windows. That meant we not only needed to be able to build Spark Core on Windows but also use it as a loadable addon for Node.js.

Node.js addon in pure Swift? That appeared to be surprisingly easy. Swift perfectly imports N-API headers. We still need three lines of C code plus one small C header to define addon entry point, but all logic is in Swift. Due to the crossplatform nature of Node.js, we were able to use macOS as a development platform with Xcode as IDE, and then use the agility of CMake to build the same code on Windows.

Since the first day we started, Swift on Windows did a giant step forward in terms of platform support and stability. I’d say, if you are thinking about extending your existing application codebase to platforms other than macOS/iOS – you absolutely can do it with Swift now, or, at least, soon. If you are maintaining a small Swift library – you could easily add Windows support already!

— Alexander Smarus; Product Engineering Lead at Spark Team, Readdle Inc

More details are available on Readdle’s blog.

Adding support for Windows to Swift is the beginning of a journey. The current support sets the first milestone where the language is usable. There is yet another even broader part of the ecosystem like lldb and the Swift Package Manager which still need more work to be as complete in their support for this different platform.

Getting Started and Getting Involved!

The Getting Started section has been updated with new information about using Swift on Windows! For the early adopters who are getting started and finding issues, please report them to the Swift Bug Tracker.

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There are many opportunities for those interested in helping push Swift on Windows forward. One of the things that makes Swift easy to use is libraries: publishing new libraries and packages for Swift on Windows or porting existing ones is another way to get involved and help make working with Swift an ever greater delight.

For the ones interested in working on core tooling, there is plenty of work to be done to improve the debugger and to improve the Windows support in the Swift Package Manager. We invite you to check out the Swift Bug Tracker for the current issues and to send patches to the GitHub repositories. There is also a new section on the Swift forums to discuss the development of Swift on Windows. There the community can discuss issues or you can introduce yourself and let others know what area of the tooling you are focusing on. This is the perfect opportunity to become involved in the project and help it grow into a strong, vibrant, cross-platform ecosystem. We cannot wait to see what exciting things you build with Swift!