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REPL.md

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# Optional
$ sudo xcode-select -s /Applications/Xcode.app

# Run the SWIFT REPL on Mavericks:
$ xcrun swift

# Run the SWIFT REPL on Yosemite:
$ swift

# If it doesn't work, run it twice.
# (You should only have to do the first time, if at all.)
$ xcrun swift

Some basic commands:

// For a help menu:
> :help

// To exit:
> :exit

You can reuse values:

> 100
$R0: Int = 100
> $R0 + 200
$R1: Int = 300

References