You can run Swift code from the command line?
WAT? Now this is something else! practicalswift.com
Command Prompt
Ah-ha! I found this nice little feature in the “Command Prompt” in Windows 7: hit the F7 key...
DOS HERE and opening a command prompt in Windows 7
In Windows XP, Microsoft released PowerToys with a DOSHERE tool that allowed you to open a command prompt...