Swift REPL - Interactive Swift

This is Swift’s REPL (Read-Evaluate-Print Loop) which lets us execute code interactively.

alias swift='/Applications/Xcode6-Beta4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift'

Note: You can alternatively set the DEVELOPER_DIR environment variable, or of course add this to your PATH.

This allows such things as:

[peacock@trashcan ~]$ swift 
Welcome to Swift!  Type :help for assistance.
  1> let seats = 7
seats: Int = 7
  2> let family = 3
family: Int = 3
  3> var extraSpace = (seats - family)
extraSpace: (Int) = 4
  4> :exit