Even if you're a seasoned pro at the language of your choice, cheat sheets still come in handy as a quick reference guide, so head on over and grab what you need. Some sheets are image or PDF ...

That code is from “ Programming in Lua by Roberto Ierusalimschy, which was written for Lua 5.0. Now Lua is at version 5.1, that work is a little out of date but still useful as a starting point.