Getting started with Swift Language Introduction Topic

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Examples

• 27

  Your first Swift program

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  27

  Write your code in a file named hello.swift:

  print("Hello, world!")
  

  To compile and run a script in one step, use swift from the command line:

  $ swift hello.swift
  Hello, world!

  To compile and run separately, use swiftc:

  $ swiftc hello.swift
  $ ./hello
  Hello, world!

  Or use the swift REPL (Read-Eval-Print-Loop), by typing swift from the command line, then entering your code in the interpreter:

  $  swift
  Welcome to Apple Swift. Type :help for assistance.
    1> func greet(name:String, surname:String) { 
    2.     print("Greetings \(name) \(surname)") 
    3. } 
    4>  
    5> let name = "Homer"
  name: String = "Homer"
    6> let surname = "Simpson"
  surname: String = "Simpson"
    7> greet(name: name, surname: surname)
  Greetings Homer Simpson

  edited Oct 8 at 11:12

  

  

  

  
• 9

  Your first program in Swift on a Mac (using a Playground)

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  9

  From your Mac, download and install Xcode from the Mac App Store following this link.

  After the installation is complete, open Xcode and select Get started with a Playground:

  

  On the next panel, you can give your Playground a name or you can leave it MyPlayground and press Next:

  

  Select a location where to save the Playground and press Create:

  

  The Playground will open and your screen should look something like this:

  

  Now that the Playground is on the screen, press ⇧ + cmd + Y to show the Debug Area.

  Finally delete the text inside Playground and type:

  print("Hello world")
  

  You should see 'Hello world' in the Debug Area and "Hello world\n" in the right Sidebar:

  

  Congratulations! You've created your first program in Swift!

  edited Aug 7 at 3:53

  

  

  
• 1

  Installing Swift

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  1

  First, download the compiler and components.

  Next, add Swift to your path. On macOS, the default location for the downloadable toolchain is /Library/Developer/Toolchains. Run the following command in Terminal:

  export PATH=/Library/Developer/Toolchains/swift-latest.xctoolchain/usr/bin:"${PATH}"
  

  On Linux, you will need to install clang:

  $ sudo apt-get install clang
  

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

  $ export PATH=/path/to/Swift/usr/bin:"${PATH}"
  

  You can verify you have the current version of Swift by running this command:

  $ swift --version
  

  created Jul 22 at 5:00