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After about 53-th minute Odersky gets lost in side effects in a very simple code.

This is why there's nothing elegant about Scala.

The OP points out that immutable code is the standard in Scala. You have picked an example where Odersky gets 'lost' in mutable code. If anything, this video (and your comment) makes the case for immutable and side-effect free code using Actors and FP, as apparently it can be confusing.

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