We've added a whole tutorial on functions, complete with five talk-throughs and three challenges. The tutorial covers defining custom functions, passing parameters to them, returning values, variable scope, and the "magic" global functions in Processing. Check it out!
![](http://2.bp.blogspot.com/-5vrBqS3qpNI/UlDIiLOMEhI/AAAAAAAAAFY/DPfANmfpGI8/s540/Screen+Shot+2013-10-05+at+7.18.36+PM.png)
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