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I think this is just a case of different viewpoints. The author clearly states himself in the last paragraph that learning Scala in under 3 weeks should not be expected. Personally, I consider any language that I can't learn to a reasonable level in 2 days difficult.

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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...

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.

He actually states becoming an expert in Scala in 3 weeks should not be expected, not learning Scala.

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