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I would say JavaScript - there is no aspect of web, mobile or desktop (QML) programming that is untouched by JS. I regret very much that I'm not very good at J

I would say JavaScript - there is no aspect of web, mobile or desktop (QML) programming that is untouched by JS. I regret very much that I'm not very good at JS - and I have a hard time working with JS. Offtopic - really hope @zedshaw writes a learnjsthehardway.

mcintyre1994 13y ago
If you want the breadth of web+mobile+desktop then Java is the other definite consideration. It really depends whether you end up more on web or desktop, but it'll give you a similarly strong breadth across those areas.