How do I access Swift's REPL?

Question

I would like to know how to do this from the CLI so that I can test out some codes without launching Xcode. I saw someone did this but I couldn't find a way to do this yet.

None of this is necessary anymore. All you have to do now is open your terminal and type swift and hit enter. — jungledev, Mar 22 '16 at 18:10

Vinicius Miana · Accepted Answer · 2014-09-25T11:44:42.510

37

After installing the Xcode6 beta, do

$ sudo xcode-select -s /Applications/Xcode6-Beta.app/Contents/Developer/

$ xcrun swift

is a Swift REPL

EDITED:

For XCode 6, use:

xcrun swift -sdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk

edited Sep 25 '14 at 11:44

answered Jun 03 '14 at 23:45

Vinicius Miana

2,047
17
27

Thank you. I assume to switch this back to the regular Xcode CLI, I just do `sudo xcode-select -s /Applications/Xcode.app/Contents/Developer/` ? – Enrico Susatyo Jun 03 '14 at 23:47
1

Yes, this selects which xcrun, xcodebuild, cc and other command line compile tools location – Vinicius Miana Jun 03 '14 at 23:50
One more stupid question: How do I exit the CLI? – Enrico Susatyo Jun 03 '14 at 23:57
5

:help inside REPL for help, :quit exits. – Vinicius Miana Jun 03 '14 at 23:59
@EnricoSusatyo ctrl+D also works to exit – Gagan Singh Jul 21 '14 at 20:09
Xcode 6.0.1, this doesn't appear to be supported for MacOX10.9? Got ":0: error: the SDK 'MacOSX10.9.sdk' does not support Swift" – kawingkelvin Sep 24 '14 at 16:24
After the an update in XCode, you may need to run xcode-select again. With XCode 6, there is a new trick. See my edited answer – Vinicius Miana Sep 25 '14 at 11:43

score 16 · Answer 2 · answered Jun 04 '14 at 02:50

To extend on @vinicius answer, you can also use it without changing your default Xcode by using:

DEVELOPER_DIR=/Applications/Xcode6-Beta.app/Contents/Developer/ xcrun swift

The easiest way to do that will be to edit your .bashrc and append:

alias swift='DEVELOPER_DIR=/Applications/Xcode6-Beta.app/Contents/Developer/ xcrun swift'

At that point you'll be able to run it just by typing swift

If you use a csh variant you'll need:

env DEVELOPER_DIR=/Applications/Xcode6-Beta.app/Contents/Developer/ xcrun swift

and create the alias with

alias swift 'env DEVELOPER_DIR=/Applications/Xcode6-Beta.app/Contents/Developer/ xcrun swift'

How do I access Swift's REPL?

2 Answers2