This is great for anyone trying to understand immutability with a brain that's been thinking mutably for too long. I've been there!https://twitter.com/nickstanch/status/784157146682429441 …
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sadly I've had too many instances of having to go to mutable data structures for performance reasons
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order of magnitude. If I can find/write a faster immutable HashMap it might be usable, but the out of the box Scala impl, nah
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There's also some Option boxing going on in scala.collection.immutable.Map. IIRC I got a 4x improvement with a specialized rewrite.
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