Slides for my Swift as a scripting language iOSDevUK14 Lightning talk, covering: - how to launch swift (lldb) as an interpreter, from the command line - creating a proper alias - testing swift inside lldb REPL - writing .swift programs using your favorite editor - launching .swift scripts from the command line - possibilities and implications (beware Python-ists and Ruby-ists ;-) )

1. Swi$%as%a%Scrip+ng%Language
iOSDevUK)2014)Swi/)300)talks
Diego&Freniche&(@dfreniche)

2. • how%to%launch%swi.%(lldb)%as%an%interpreter,%from%the%command%
line
• crea9ng%a%proper%alias
• tes9ng%swi.%inside%lldb%REPL
• wri9ng%.swi.%programs%using%your%favorite%editor
• launching%.swi.%scripts%from%the%command%line%
• possibili9es%and%implica9ons%(beware%PythonBists%and%RubyB
ists%;B)%)

3. Lots%of%things%to%love%in%Swi0
• Mul%&paradigm:/Procedural,/OOP,/Func%onal,/Generics
• Modern
• Much/needed/improvements
• Not/C/C++/compa%ble!/!/

4. One$thing$it$impressed$me$the$most
• terse&syntax
• no&boilerplate&code:&just&what&you&need
• type&inference
var s: String = "Hello, long, with type"
var s2 = "Terse"

5. Launch'Swi+:'Bash'script'(swi+.sh)
#!/bin/bash
# Bash script to launch swift in command line
# it works even with Xcode5 and several Xcode-Beta installed
NEW_XCODE=$(ls -m1 -d /Applications/Xcode6* | tail -r -n 1)/Contents/Developer
echo using $NEW_XCODE
$NEW_XCODE/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -sdk $NEW_XCODE

6. Launch'Swi+:'Bash'script'(swi+.sh)
Don't&panic!:"There's"a"convenient"Gist
h"ps://gist.github.com/dfreniche/1f3f17ddbd9d3b04a6a0

7. Inside'swi)'(lldb)
:help - help
:quit - quit
Brought(to(you(by(Captain(Obvious

8. That's'a'REPL!
REPL:&Read&Eval&Print&Loop
Welcome to Swift! Type :help for assistance.
1> var s = "Hello, iOSDevUK!"
s: String = "Hello, iOSDevUK!"
2>

9. Wri$ng'Swi*'scripts
shebang(style,launching:,
#!/usr/bin/xcrun swift

10. Example
#!/usr/bin/env xcrun swift
println("Process.arguments gave args:")
for s in Process.arguments {
println(s)
}
Remember!to
sudo xcode-select --switch /Applications/Xcode6-Beta6.app/

11. Which%editor?%(troll%ques1on)
• vi,%emacs,%Chocolat,%ST,%...%the%one%that%makes%you%happy

12. Consequences
• more&scrip+ng&done&in&Swi1
• full&stack&web&Swi1&Apps&(frontend,&backend)
• more&func+onal&bits&of&code&all&over&the&place