A lot of people come asking how to learn from Clojure's approach to concurrency, when usually the answer is just that referential transparency makes it a non-issue.

"When he heard this, he left very sad, because he was a man of great wealth."

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Sell all your mutable data structures and give to the poor, and you will have concurrency.

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It's easier for a camel to go through the eye of a needle than for an imperative program to run concurrently without bugs.