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Any language which uses concepts which you haven't used before (Like Functional Programming or in the other direction OOP etc.) will need more than 2 days. You will need the time to learn the new concepts and not the language. So the language per se isn't difficult but the new concepts...

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I've been an OO programmer for a long time and I really, really like the way functional programming works. It takes some time to re-think your previous assumptions, but even when in pure Java, a more functional approach provides a much better code. And, maybe it's because I've used another languages that I find Scala pretty straight forward.

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