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I've never used Mac before and am considering using it for development (at work I may have an option of using one). When it comes to Processing I wondered if the transition would be seamless and if all my old code would work fine?
@Patakk -- a number of regulars on the forum (and I believe some core Processing developers) are Mac users, and it works fine. I've been very happy with Processing on OS X 10.7 - 10.12. Some platform-dependent things you should consider:
File > Export Application