Functions in AutoHotkey are a great tool to have in your bag! They can definitely help simplify your code, ease re-purposing of code and avoid a lot of simple mistakes by keeping the variables local (instead of global). AHK Studio is an editor written in and for AutoHotkey. It helps both noobs & gurus write great code and is worth a deep look!
The below video reviews a few tips & tricks for working with functions.
Functions in AutoHotkey
As I previously reviewed, functions in AHK rock! The below video demonstrates how easy it is to use the utilize the include command in AutoHotkey to leverage functions & libraries that are not in your main file. Without using the include command AHK will first look in your local library, then look under the myDocuments\AutoHotkey\Lib\ folder and finally under path-to-running-AutoHotkey.exe\lib\.
By using the include command you can specifically tell AHK to look in a given file.
Include command in AutoHotkey