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The first step to using Swift is to download and install the compiler and other required components. Go to the Download page and follow the instructions for your target platform. You can make the latest installed toolchain available for use from the terminal with the following command:.
If you installed the Swift toolchain on Linux to a directory other than the system root, you will need to run the following command, using the actual path of your Swift installation:. Python 1 used by the debugger - lldb. In order to develop applications, particularly with the Swift Package Manager, you will need to enable developer mode. The platform dependencies cannot be installed through the Windows Package Manager as the install rules do not install the components necessary.
They will be installed through Visual Studio installer. Swift can be installed through the official installer directly, or using the Windows Package Manager as well. Notice that Windows Package Manager release may be behind the official release. Swift has been tested with Visual Studio You will need to install Visual Studio with the following components. The installer for Swift is available in the Download section.
Because it is installing the files into the Visual Studio image, the files will need to be copied each time Visual Studio is updated.
If Visual Studio is updated, you may have to repair the installation. You can verify that you are running the expected version of Swift by entering the swift command and passing the --version flag:. You can assign values to constants and variables, and use them in subsequent lines. For instance, the String value Hello, world! If you enter an invalid expression, the REPL will print an error showing where the problem occurred:.
This allows you to make a slight change to a previous expression without retyping the entire line, and is especially convenient for fixing errors like the one in the previous example:. Another useful feature of the REPL is that it can automatically suggest functions and methods that can be used in a particular context. All of the functionality of Swift is available to you from the REPL, from writing control flow statements to declaring and instantiating structures and classes. You must ensure that Python 3.
The following command adds Python 3. This allows you to use multiple different SDKs with the same toolchain. Swift package manager provides a convention-based system for building 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.
To create a new Swift package, first create and enter a directory named Hello :. Every package must have a manifest file called Package. You can create a minimal package named Hello using:. You can use swift build to build a package. This will download, resolve and compile dependencies mentioned in the manifest file Package.
To run the tests for a package, use: swift test. A target is considered as an executable if it contains a file named main. The package manager will compile that file into a binary executable. First create and enter a directory called Hello :. Use the swift run command to build and run the executable:. Note: Since there is only one executable in this package, we can omit the executable name from the swift run command.
You can also compile the package by running the swift build command and then run the binary from. Now, open main. Rather than using a hardcoded name as before, main. 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. You can use the LLDB debugger to run 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. This will create an executable named Factorial in the current directory. Instead of running the Factorial program directly, run it through the LLDB debugger by passing it as a command line argument to the lldb command.
Set a breakpoint on line 2 of the factorial n: function with 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 command to inspect the value of the n parameter. The print command can evaluate Swift expressions as well. Use the backtrace bt command to show the frames leading to factorial n: being called.
Use the continue c command to resume the process until the breakpoint is hit again. Use the print p command again to inspect the value of the n parameter for the second call to factorial n:. Use the breakpoint disable br di command to disable all breakpoints and the continue c command to have the process run until it exits.
The windows binaries are built against Python 3. You may install a newer SDK instead. Type :help for assistance. HelloTests testExample]' started. Test Case '-[HelloTests. HelloTests testExample]' passed 0. Test Suite 'HelloTests' passed at Executed 1 test , with 0 failures 0 unexpected in 0.
Windows 10 SDK
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